#include<stdio.h>
int main()
{
    int a,b,w;
    while(scanf("%d%d%d",&w,&a,&b)==3&&w!=NULL)
    {
        if(a+w<b)
            printf("%d\n",b-a-w);
       else if(b+w<a)
            printf("%d\n",a-b-w);
        else
            printf("0\n");
    }
    return 0;
}

; ModuleID = '/data/TheStack_IR/OJ_Samples/Collated/ObjectiveC/Source_819/source.m'
source_filename = "/data/TheStack_IR/OJ_Samples/Collated/ObjectiveC/Source_819/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"

@.str = private unnamed_addr constant [7 x i8] c"%d%d%d\00", align 1
@.str.1 = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1
@str = private unnamed_addr constant [2 x i8] c"0\00", align 1

; Function Attrs: nofree nounwind uwtable
define dso_local i32 @main() local_unnamed_addr #0 {
entry:
  %a = alloca i32, align 4
  %b = alloca i32, align 4
  %w = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %a) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %b) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %w) #4
  %call18 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %w, ptr noundef nonnull %a, ptr noundef nonnull %b)
  %cmp19 = icmp eq i32 %call18, 3
  %0 = load i32, ptr %w, align 4
  %cmp120 = icmp ne i32 %0, 0
  %1 = select i1 %cmp19, i1 %cmp120, i1 false
  br i1 %1, label %while.body, label %while.end

while.body:                                       ; preds = %entry, %if.end16
  %2 = phi i32 [ %5, %if.end16 ], [ %0, %entry ]
  %3 = load i32, ptr %a, align 4, !tbaa !5
  %add = add nsw i32 %3, %2
  %4 = load i32, ptr %b, align 4, !tbaa !5
  %cmp3 = icmp slt i32 %add, %4
  br i1 %cmp3, label %if.then, label %if.else

if.then:                                          ; preds = %while.body
  %sub5 = sub i32 %4, %add
  %call6 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %sub5)
  br label %if.end16

if.else:                                          ; preds = %while.body
  %add7 = add nsw i32 %4, %2
  %cmp8 = icmp slt i32 %add7, %3
  br i1 %cmp8, label %if.then10, label %if.else14

if.then10:                                        ; preds = %if.else
  %sub12 = sub i32 %3, %add7
  %call13 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %sub12)
  br label %if.end16

if.else14:                                        ; preds = %if.else
  %puts = call i32 @puts(ptr nonnull dereferenceable(1) @str)
  br label %if.end16

if.end16:                                         ; preds = %if.then10, %if.else14, %if.then
  %call = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %w, ptr noundef nonnull %a, ptr noundef nonnull %b)
  %cmp = icmp eq i32 %call, 3
  %5 = load i32, ptr %w, align 4
  %cmp1 = icmp ne i32 %5, 0
  %6 = select i1 %cmp, i1 %cmp1, i1 false
  br i1 %6, label %while.body, label %while.end

while.end:                                        ; preds = %if.end16, %entry
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %w) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %b) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %a) #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: nofree nounwind
declare noundef i32 @puts(ptr nocapture noundef readonly) local_unnamed_addr #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 = { nofree nounwind }
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"}
