#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 */
scalar_t__ EOF;
int /*<<< orphan*/ printf(char *, int);
scalar_t__ scanf(char *, int *, int *);
int main(void) {
  int n, m;
  while (EOF != scanf("%d %d", &n, &m))
    printf("%d\n", n * m * 2);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    0x2eb2(%rip),%rax
mov    (%rax),%rax
mov    %rax,-0x18(%rbp)
lea    0xebc(%rip),%rdi
lea    -0x8(%rbp),%rsi
lea    -0xc(%rbp),%rdx
call   1040 <scanf@plt>
mov    %rax,%rcx
mov    -0x18(%rbp),%rax
cmp    %rcx,%rax
je     117c <main+0x5c>
mov    -0x8(%rbp),%esi
imul   -0xc(%rbp),%esi
shl    $0x1,%esi
lea    0xe94(%rip),%rdi
call   1030 <printf@plt>
jmp    112f <main+0xf>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
push   %rax
mov    0x2eb6(%rip),%r13
mov    0x0(%r13),%rbx
lea    0xec3(%rip),%rdi
lea    0x4(%rsp),%rsi
mov    %rsp,%rdx
call   1040 <scanf@plt>
cmp    %rax,%rbx
je     1199 <main+0x79>
lea    0xeb0(%rip),%r14
lea    0xea3(%rip),%r15
lea    0x4(%rsp),%r12
mov    %rsp,%rbx
cs nopw 0x0(%rax,%rax,1)
nop
mov    0x4(%rsp),%esi
imul   (%rsp),%esi
add    %esi,%esi
mov    %r14,%rdi
call   1030 <printf@plt>
mov    0x0(%r13),%rbp
mov    %r15,%rdi
mov    %r12,%rsi
mov    %rbx,%rdx
call   1040 <scanf@plt>
cmp    %rax,%rbp
jne    1170 <main+0x50>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@EOF = global i64 0
@.str = [6 x i8] c"%d %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 = %8, %0
%5 = load i64, i64* @EOF
%6 = call i64 @scanf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32* %2, i32* %3)
%7 = icmp ne i64 %5, %6
br i1 %7, label %8, label %14
8: ; preds = %4
%9 = load i32, i32* %2
%10 = load i32, i32* %3
%11 = mul nsw i32 %9, %10
%12 = mul nsw i32 %11, 2
%13 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %12)
br label %4
14: ; preds = %4
ret i32 0
}

LLVM IR (-O2):
@EOF = global i64 0
@.str = [6 x i8] c"%d %d\00"
@.str.1 = [4 x i8] c"%d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = bitcast i32* %1 to i8*
%4 = bitcast i32* %2 to i8*
%5 = load i64, i64* @EOF
%6 = call i64 @scanf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32* %1, i32* %2)
%7 = icmp eq i64 %5, %6
br i1 %7, label %17, label %8
8: ; preds = %0, %8
%9 = load i32, i32* %1
%10 = load i32, i32* %2
%11 = shl i32 %9, 1
%12 = mul i32 %11, %10
%13 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %12)
%14 = load i64, i64* @EOF
%15 = call i64 @scanf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32* %1, i32* %2)
%16 = icmp eq i64 %14, %15
br i1 %16, label %17, label %8
17: ; preds = %8, %0
ret i32 0
}