#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int /*<<< orphan*/ f(int);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, int *);
int main() {
  int n;
  scanf("%d", &n);
  if (n == 1)
    printf("1\n");
  else if (n == 2)
    printf("2\n");
  else
    printf("%lld\n", f(n));
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeba(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1050 <scanf@plt>
cmpl   $0x1,-0x8(%rbp)
jne    116c <main+0x3c>
lea    0xea3(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
jmp    11a6 <main+0x76>
cmpl   $0x2,-0x8(%rbp)
jne    1189 <main+0x59>
lea    0xe89(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
jmp    11a1 <main+0x71>
mov    -0x8(%rbp),%edi
call   1030 <f@plt>
mov    %eax,%esi
lea    0xe6f(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
jmp    11a6 <main+0x76>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xeb8(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1060 <scanf@plt>
mov    0x4(%rsp),%edi
cmp    $0x2,%edi
je     116e <main+0x2e>
cmp    $0x1,%edi
jne    117c <main+0x3c>
lea    0xea4(%rip),%rdi
call   1030 <puts@plt>
jmp    1191 <main+0x51>
lea    0xe94(%rip),%rdi
call   1030 <puts@plt>
jmp    1191 <main+0x51>
call   1040 <f@plt>
lea    0xe7b(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1050 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [3 x i8] c"%d\00"
@.str.1 = [3 x i8] c"1\0A\00"
@.str.2 = [3 x i8] c"2\0A\00"
@.str.3 = [6 x i8] c"%lld\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
store i32 0, i32* %1
%3 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %2)
%4 = load i32, i32* %2
%5 = icmp eq i32 %4, 1
br i1 %5, label %6, label %8
6: ; preds = %0
%7 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0))
br label %18
8: ; preds = %0
%9 = load i32, i32* %2
%10 = icmp eq i32 %9, 2
br i1 %10, label %11, label %13
11: ; preds = %8
%12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0))
br label %17
13: ; preds = %8
%14 = load i32, i32* %2
%15 = call i32 @f(i32 %14)
%16 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.3, i64 0, i64 0), i32 %15)
br label %17
17: ; preds = %13, %11
br label %18
18: ; preds = %17, %6
ret i32 0
}

LLVM IR (-O2):
@.str = [3 x i8] c"%d\00"
@.str.3 = [6 x i8] c"%lld\0A\00"
@str = [2 x i8] c"2\00"
@str.4 = [2 x i8] c"1\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %1)
%4 = load i32, i32* %1
switch i32 %4, label %9 [
i32 1, label %5
i32 2, label %7
]
5: ; preds = %0
%6 = call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([2 x i8], [2 x i8]* @str.4, i64 0, i64 0))
br label %12
7: ; preds = %0
%8 = call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([2 x i8], [2 x i8]* @str, i64 0, i64 0))
br label %12
9: ; preds = %0
%10 = call i32 @f(i32 %4)
%11 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([6 x i8], [6 x i8]* @.str.3, i64 0, i64 0), i32 %10)
br label %12
12: ; preds = %7, %9, %5
ret i32 0
}