#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*/ printf(char *, int);
int scanf(char *, int *);
int main() {
  int n, a;
  while (scanf("%d", &n) == 1) {
    if (n == 0) {
      break;
    } else {
      a = 3 * n / 2;
    }
    printf("%d\n", a - n);
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
cmp    $0x1,%eax
jne    117d <main+0x5d>
cmpl   $0x0,-0x8(%rbp)
jne    1157 <main+0x37>
jmp    117d <main+0x5d>
imul   $0x3,-0x8(%rbp),%eax
mov    $0x2,%ecx
cltd
idiv   %ecx
mov    %eax,-0xc(%rbp)
mov    -0xc(%rbp),%esi
sub    -0x8(%rbp),%esi
lea    0xe90(%rip),%rdi
call   1030 <printf@plt>
jmp    112f <main+0xf>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %rbx
sub    $0x10,%rsp
lea    0xed0(%rip),%rdi
lea    0xc(%rsp),%rsi
call   1040 <scanf@plt>
cmp    $0x1,%eax
jne    118e <main+0x6e>
mov    0xc(%rsp),%eax
test   %eax,%eax
je     118e <main+0x6e>
lea    0xeb5(%rip),%r14
lea    0xeab(%rip),%r15
lea    0xc(%rsp),%rbx
nopw   0x0(%rax,%rax,1)
lea    (%rax,%rax,2),%ecx
mov    %ecx,%esi
shr    $0x1f,%esi
add    %ecx,%esi
sar    %esi
sub    %eax,%esi
mov    %r14,%rdi
call   1030 <printf@plt>
mov    %r15,%rdi
mov    %rbx,%rsi
call   1040 <scanf@plt>
cmp    $0x1,%eax
jne    118e <main+0x6e>
mov    0xc(%rsp),%eax
test   %eax,%eax
jne    1160 <main+0x40>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [3 x i8] c"%d\00"
@.str.1 = [4 x i8] c"%d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 0, i32* %1
br label %4
4: ; preds = %15, %0
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %2)
%6 = icmp eq i32 %5, 1
br i1 %6, label %7, label %20
7: ; preds = %4
%8 = load i32, i32* %2
%9 = icmp eq i32 %8, 0
br i1 %9, label %10, label %11
10: ; preds = %7
br label %20
11: ; preds = %7
%12 = load i32, i32* %2
%13 = mul nsw i32 3, %12
%14 = sdiv i32 %13, 2
store i32 %14, i32* %3
br label %15
15: ; preds = %11
%16 = load i32, i32* %3
%17 = load i32, i32* %2
%18 = sub nsw i32 %16, %17
%19 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %18)
br label %4
20: ; preds = %10, %4
ret i32 0
}

LLVM IR (-O2):
@.str = [3 x i8] c"%d\00"
@.str.1 = [4 x i8] c"%d\0A\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 = icmp ne i32 %3, 1
%5 = load i32, i32* %1
%6 = icmp eq i32 %5, 0
%7 = select i1 %4, i1 true, i1 %6
br i1 %7, label %19, label %8
8: ; preds = %0, %8
%9 = phi i32 [ %16, %8 ], [ %5, %0 ]
%10 = mul nsw i32 %9, 3
%11 = sdiv i32 %10, 2
%12 = sub nsw i32 %11, %9
%13 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %12)
%14 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %1)
%15 = icmp ne i32 %14, 1
%16 = load i32, i32* %1
%17 = icmp eq i32 %16, 0
%18 = select i1 %15, i1 true, i1 %17
br i1 %18, label %19, label %8
19: ; preds = %8, %0
ret i32 0
}