/******************************************************************************

                            Online C Compiler.
                Code, Compile, Run and Debug C program online.
Write your code in this editor and press "Run" button to compile and execute it.

*******************************************************************************/

#include <stdio.h>
int A[100000]={};

int main()
{
    int n;
    scanf("%d",&n);
    int i;
    int mc = 0;
    long long sum = 0;
    long long lmin = -1000000000;
    long long rmin = 1000000000;
    long long min = 0;
    for(i=0;i<n;i++){
        scanf("%d",&A[i]);
        if(A[i]<0){
            mc++;
            if(lmin<A[i]){
                lmin = A[i];
            }
        }
        else{
            if(rmin>A[i]){
                rmin = A[i];
            }
        }
    }
    if(lmin==0 || rmin ==0)min = 0;
    else if((-lmin)>rmin)min = rmin;
    else min = -lmin;
    //printf("%d %d\n",lmin,rmin);
    for(i=0;i<n;i++){
        if(A[i]>0)
            sum+=A[i];
        else
            sum+=(-A[i]);
    //printf("%lld\n",sum);
    }
    if(mc%2 != 0){
        
        sum = sum-2*min;
    }
    printf("%lld",sum);
    return 0;
}

; ModuleID = '/data/TheStack_IR/OJ_Samples/Collated/ObjectiveC/Source_313/source.m'
source_filename = "/data/TheStack_IR/OJ_Samples/Collated/ObjectiveC/Source_313/source.m"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-linux-gnu"

@A = dso_local global [100000 x i32] zeroinitializer, align 16
@.str = private unnamed_addr constant [3 x i8] c"%d\00", align 1
@.str.1 = private unnamed_addr constant [5 x i8] c"%lld\00", align 1

; Function Attrs: nofree nounwind uwtable
define dso_local i32 @main() local_unnamed_addr #0 {
entry:
  %n = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %n) #4
  %call = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %n)
  %0 = load i32, ptr %n, align 4, !tbaa !5
  %cmp91 = icmp sgt i32 %0, 0
  br i1 %cmp91, label %for.body, label %for.end59

for.cond38.preheader:                             ; preds = %for.inc
  %1 = and i32 %mc.1, 1
  %2 = icmp eq i32 %1, 0
  %cmp3999 = icmp sgt i32 %20, 0
  br i1 %cmp3999, label %for.body41.preheader, label %for.end59

for.body41.preheader:                             ; preds = %for.cond38.preheader
  %wide.trip.count = zext i32 %20 to i64
  %min.iters.check = icmp ult i32 %20, 4
  br i1 %min.iters.check, label %for.body41.preheader118, label %vector.ph

vector.ph:                                        ; preds = %for.body41.preheader
  %n.vec = and i64 %wide.trip.count, 4294967292
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.phi = phi <2 x i64> [ zeroinitializer, %vector.ph ], [ %15, %vector.body ]
  %vec.phi116 = phi <2 x i64> [ zeroinitializer, %vector.ph ], [ %16, %vector.body ]
  %3 = getelementptr inbounds [100000 x i32], ptr @A, i64 0, i64 %index
  %wide.load = load <2 x i32>, ptr %3, align 16, !tbaa !5
  %4 = getelementptr inbounds i32, ptr %3, i64 2
  %wide.load117 = load <2 x i32>, ptr %4, align 8, !tbaa !5
  %5 = icmp sgt <2 x i32> %wide.load, zeroinitializer
  %6 = icmp sgt <2 x i32> %wide.load117, zeroinitializer
  %7 = zext <2 x i32> %wide.load to <2 x i64>
  %8 = zext <2 x i32> %wide.load117 to <2 x i64>
  %9 = sub nsw <2 x i32> zeroinitializer, %wide.load
  %10 = sub nsw <2 x i32> zeroinitializer, %wide.load117
  %11 = sext <2 x i32> %9 to <2 x i64>
  %12 = sext <2 x i32> %10 to <2 x i64>
  %13 = select <2 x i1> %5, <2 x i64> %7, <2 x i64> %11
  %14 = select <2 x i1> %6, <2 x i64> %8, <2 x i64> %12
  %15 = add <2 x i64> %13, %vec.phi
  %16 = add <2 x i64> %14, %vec.phi116
  %index.next = add nuw i64 %index, 4
  %17 = icmp eq i64 %index.next, %n.vec
  br i1 %17, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %bin.rdx = add <2 x i64> %16, %15
  %18 = call i64 @llvm.vector.reduce.add.v2i64(<2 x i64> %bin.rdx)
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %for.end59, label %for.body41.preheader118

for.body41.preheader118:                          ; preds = %for.body41.preheader, %middle.block
  %indvars.iv105.ph = phi i64 [ 0, %for.body41.preheader ], [ %n.vec, %middle.block ]
  %sum.0101.ph = phi i64 [ 0, %for.body41.preheader ], [ %18, %middle.block ]
  br label %for.body41

for.body:                                         ; preds = %entry, %for.inc
  %indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
  %rmin.095 = phi i64 [ %rmin.1, %for.inc ], [ 1000000000, %entry ]
  %lmin.094 = phi i64 [ %lmin.1, %for.inc ], [ -1000000000, %entry ]
  %mc.093 = phi i32 [ %mc.1, %for.inc ], [ 0, %entry ]
  %arrayidx = getelementptr inbounds [100000 x i32], ptr @A, i64 0, i64 %indvars.iv
  %call1 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %arrayidx)
  %19 = load i32, ptr %arrayidx, align 4, !tbaa !5
  %cmp4 = icmp slt i32 %19, 0
  br i1 %cmp4, label %if.then, label %if.else

if.then:                                          ; preds = %for.body
  %inc = add nsw i32 %mc.093, 1
  %conv = sext i32 %19 to i64
  %spec.select = call i64 @llvm.smax.i64(i64 %lmin.094, i64 %conv)
  br label %for.inc

if.else:                                          ; preds = %for.body
  %conv15 = zext i32 %19 to i64
  %spec.select90 = call i64 @llvm.smin.i64(i64 %rmin.095, i64 %conv15)
  br label %for.inc

for.inc:                                          ; preds = %if.else, %if.then
  %mc.1 = phi i32 [ %inc, %if.then ], [ %mc.093, %if.else ]
  %lmin.1 = phi i64 [ %spec.select, %if.then ], [ %lmin.094, %if.else ]
  %rmin.1 = phi i64 [ %rmin.095, %if.then ], [ %spec.select90, %if.else ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %20 = load i32, ptr %n, align 4, !tbaa !5
  %21 = sext i32 %20 to i64
  %cmp = icmp slt i64 %indvars.iv.next, %21
  br i1 %cmp, label %for.body, label %for.cond38.preheader

for.body41:                                       ; preds = %for.body41.preheader118, %for.body41
  %indvars.iv105 = phi i64 [ %indvars.iv.next106, %for.body41 ], [ %indvars.iv105.ph, %for.body41.preheader118 ]
  %sum.0101 = phi i64 [ %sum.1, %for.body41 ], [ %sum.0101.ph, %for.body41.preheader118 ]
  %arrayidx43 = getelementptr inbounds [100000 x i32], ptr @A, i64 0, i64 %indvars.iv105
  %22 = load i32, ptr %arrayidx43, align 4, !tbaa !5
  %cmp44 = icmp sgt i32 %22, 0
  %conv49 = zext i32 %22 to i64
  %sub53 = sub nsw i32 0, %22
  %conv54 = sext i32 %sub53 to i64
  %conv49.pn = select i1 %cmp44, i64 %conv49, i64 %conv54
  %sum.1 = add nsw i64 %conv49.pn, %sum.0101
  %indvars.iv.next106 = add nuw nsw i64 %indvars.iv105, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next106, %wide.trip.count
  br i1 %exitcond.not, label %for.end59, label %for.body41, !llvm.loop !12

for.end59:                                        ; preds = %for.body41, %middle.block, %entry, %for.cond38.preheader
  %rmin.0.lcssa115 = phi i64 [ %rmin.1, %for.cond38.preheader ], [ 1000000000, %entry ], [ %rmin.1, %middle.block ], [ %rmin.1, %for.body41 ]
  %lmin.0.lcssa114 = phi i64 [ %lmin.1, %for.cond38.preheader ], [ -1000000000, %entry ], [ %lmin.1, %middle.block ], [ %lmin.1, %for.body41 ]
  %mc.0.lcssa113 = phi i1 [ %2, %for.cond38.preheader ], [ true, %entry ], [ %2, %middle.block ], [ %2, %for.body41 ]
  %sum.0.lcssa = phi i64 [ 0, %for.cond38.preheader ], [ 0, %entry ], [ %18, %middle.block ], [ %sum.1, %for.body41 ]
  %cmp27 = icmp eq i64 %rmin.0.lcssa115, 0
  %sub = sub nsw i64 0, %lmin.0.lcssa114
  %rmin.0.sub = call i64 @llvm.smin.i64(i64 %rmin.0.lcssa115, i64 %sub)
  %23 = shl nuw nsw i64 %rmin.0.sub, 1
  %24 = select i1 %mc.0.lcssa113, i1 true, i1 %cmp27
  %sub63 = select i1 %24, i64 0, i64 %23
  %sum.2 = sub nsw i64 %sum.0.lcssa, %sub63
  %call65 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i64 noundef %sum.2)
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %n) #4
  ret i32 0
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.smin.i64(i64, i64) #3

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.smax.i64(i64, i64) #3

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.vector.reduce.add.v2i64(<2 x i64>) #3

attributes #0 = { nofree nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nofree nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #3 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #4 = { nounwind }

!llvm.linker.options = !{}
!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"Ubuntu clang version 18.0.0 (++20231007042255+8abb2ace888b-1~exp1~20231007042414.1230)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10, !11}
!10 = !{!"llvm.loop.isvectorized", i32 1}
!11 = !{!"llvm.loop.unroll.runtime.disable"}
!12 = distinct !{!12, !11, !10}
