#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 *, long);
scalar_t__ scanf(char *, long *, long *);
int main() {
  long int m, n;
  while (scanf("%ld %ld", &m, &n) != EOF) {
    printf("%ld\n", m * (n - 1) + (m - 1));
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
lea    -0x10(%rbp),%rsi
lea    -0x18(%rbp),%rdx
call   1040 <scanf@plt>
mov    0x2e9e(%rip),%rcx
cmp    (%rcx),%rax
je     117f <main+0x5f>
mov    -0x10(%rbp),%rsi
mov    -0x18(%rbp),%rax
sub    $0x1,%rax
imul   %rax,%rsi
mov    -0x10(%rbp),%rax
sub    $0x1,%rax
add    %rax,%rsi
lea    0xe93(%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   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
sub    $0x10,%rsp
lea    0xecc(%rip),%rdi
lea    0x8(%rsp),%rsi
mov    %rsp,%rdx
call   1040 <scanf@plt>
mov    0x2ea0(%rip),%r13
cmp    0x0(%r13),%rax
je     11a5 <main+0x85>
lea    0xeb3(%rip),%r14
lea    0xea4(%rip),%r15
lea    0x8(%rsp),%r12
mov    %rsp,%rbx
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
mov    0x8(%rsp),%rax
mov    (%rsp),%rcx
add    $0xffffffffffffffff,%rcx
imul   %rax,%rcx
lea    (%rax,%rcx,1),%rsi
add    $0xffffffffffffffff,%rsi
mov    %r14,%rdi
call   1030 <printf@plt>
mov    %r15,%rdi
mov    %r12,%rsi
mov    %rbx,%rdx
call   1040 <scanf@plt>
cmp    0x0(%r13),%rax
jne    1170 <main+0x50>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
ret

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

LLVM IR (-O2):
@.str = [8 x i8] c"%ld %ld\00"
@EOF = global i64 0
@.str.1 = [5 x i8] c"%ld\0A\00"
define i32 @main() {
%1 = alloca i64
%2 = alloca i64
%3 = bitcast i64* %1 to i8*
%4 = bitcast i64* %2 to i8*
%5 = call i64 @scanf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), i64* %1, i64* %2)
%6 = load i64, i64* @EOF
%7 = icmp eq i64 %5, %6
br i1 %7, label %19, label %8
8: ; preds = %0, %8
%9 = load i64, i64* %1
%10 = load i64, i64* %2
%11 = add nsw i64 %10, -1
%12 = mul nsw i64 %11, %9
%13 = add nsw i64 %9, -1
%14 = add nsw i64 %13, %12
%15 = call i32 @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i64 %14)
%16 = call i64 @scanf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), i64* %1, i64* %2)
%17 = load i64, i64* @EOF
%18 = icmp eq i64 %16, %17
br i1 %18, label %19, label %8
19: ; preds = %8, %0
ret i32 0
}