#import <stdio.h>
long f(int n,long a,long b){
  return n==0?a:n==1?b:f(n-1,b,a+b);
}
int main(){
  int n;
  scanf("%d", &n);
  printf("%ld", f(n,2,1));
}
; ModuleID = '/data/TheStack_IR/OJ_Samples/Collated/ObjectiveC/Source_674/source.m'
source_filename = "/data/TheStack_IR/OJ_Samples/Collated/ObjectiveC/Source_674/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 [3 x i8] c"%d\00", align 1
@.str.1 = private unnamed_addr constant [4 x i8] c"%ld\00", align 1

; Function Attrs: nofree norecurse nosync nounwind memory(none) uwtable
define dso_local i64 @f(i32 noundef %n, i64 noundef %a, i64 noundef %b) local_unnamed_addr #0 {
entry:
  br label %tailrecurse

tailrecurse:                                      ; preds = %cond.false3, %entry
  %n.tr = phi i32 [ %n, %entry ], [ %sub, %cond.false3 ]
  %a.tr = phi i64 [ %a, %entry ], [ %b.tr, %cond.false3 ]
  %b.tr = phi i64 [ %b, %entry ], [ %add, %cond.false3 ]
  switch i32 %n.tr, label %cond.false3 [
    i32 0, label %cond.end4.loopexit
    i32 1, label %cond.end4
  ]

cond.false3:                                      ; preds = %tailrecurse
  %sub = add nsw i32 %n.tr, -1
  %add = add nsw i64 %b.tr, %a.tr
  br label %tailrecurse

cond.end4.loopexit:                               ; preds = %tailrecurse
  br label %cond.end4

cond.end4:                                        ; preds = %tailrecurse, %cond.end4.loopexit
  %cond5 = phi i64 [ %a.tr, %cond.end4.loopexit ], [ %b.tr, %tailrecurse ]
  ret i64 %cond5
}

; Function Attrs: nofree nounwind uwtable
define dso_local i32 @main() local_unnamed_addr #1 {
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
  br label %tailrecurse.i

tailrecurse.i:                                    ; preds = %cond.false3.i, %entry
  %n.tr.i = phi i32 [ %0, %entry ], [ %sub.i, %cond.false3.i ]
  %a.tr.i = phi i64 [ 2, %entry ], [ %b.tr.i, %cond.false3.i ]
  %b.tr.i = phi i64 [ 1, %entry ], [ %add.i, %cond.false3.i ]
  switch i32 %n.tr.i, label %cond.false3.i [
    i32 0, label %f.exit
    i32 1, label %f.exit.loopexit
  ]

cond.false3.i:                                    ; preds = %tailrecurse.i
  %sub.i = add nsw i32 %n.tr.i, -1
  %add.i = add nsw i64 %b.tr.i, %a.tr.i
  br label %tailrecurse.i

f.exit.loopexit:                                  ; preds = %tailrecurse.i
  br label %f.exit

f.exit:                                           ; preds = %tailrecurse.i, %f.exit.loopexit
  %cond5.i = phi i64 [ %b.tr.i, %f.exit.loopexit ], [ %a.tr.i, %tailrecurse.i ]
  %call2 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i64 noundef %cond5.i)
  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) #2

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #3

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #3

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

attributes #0 = { nofree norecurse nosync nounwind memory(none) 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 = { 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 #2 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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 #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"}
