#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 /*<<< orphan*/ scanf(char *, int *, int *);
int main(void) {
  int a, b, c;
  scanf("%d%d", &a, &b);
  c = a - 1;
  int s = 0;
  while (c != a) {
    b += c - a;
    s += c;
    --c;
  }
  b += c;
  s += c;
  printf("%d\n", b - s);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
lea    -0x8(%rbp),%rsi
lea    -0xc(%rbp),%rdx
call   1040 <scanf@plt>
mov    -0x8(%rbp),%eax
sub    $0x1,%eax
mov    %eax,-0x10(%rbp)
movl   $0x0,-0x14(%rbp)
mov    -0x10(%rbp),%eax
cmp    -0x8(%rbp),%eax
je     1182 <main+0x62>
mov    -0x10(%rbp),%eax
sub    -0x8(%rbp),%eax
add    -0xc(%rbp),%eax
mov    %eax,-0xc(%rbp)
mov    -0x10(%rbp),%eax
add    -0x14(%rbp),%eax
mov    %eax,-0x14(%rbp)
mov    -0x10(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,-0x10(%rbp)
jmp    1153 <main+0x33>
mov    -0x10(%rbp),%eax
add    -0xc(%rbp),%eax
mov    %eax,-0xc(%rbp)
mov    -0x10(%rbp),%eax
add    -0x14(%rbp),%eax
mov    %eax,-0x14(%rbp)
mov    -0xc(%rbp),%esi
sub    -0x14(%rbp),%esi
lea    0xe64(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xed8(%rip),%rdi
lea    0x4(%rsp),%rsi
mov    %rsp,%rdx
call   1040 <scanf@plt>
mov    $0x80000000,%esi
xor    (%rsp),%esi
add    0x4(%rsp),%esi
mov    %esi,(%rsp)
xor    $0x80000000,%esi
lea    0xeb4(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [5 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
%4 = alloca i32
%5 = alloca i32
store i32 0, i32* %1
%6 = call i32 @scanf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32* %2, i32* %3)
%7 = load i32, i32* %2
%8 = sub nsw i32 %7, 1
store i32 %8, i32* %4
store i32 0, i32* %5
br label %9
9: ; preds = %13, %0
%10 = load i32, i32* %4
%11 = load i32, i32* %2
%12 = icmp ne i32 %10, %11
br i1 %12, label %13, label %24
13: ; preds = %9
%14 = load i32, i32* %4
%15 = load i32, i32* %2
%16 = sub nsw i32 %14, %15
%17 = load i32, i32* %3
%18 = add nsw i32 %17, %16
store i32 %18, i32* %3
%19 = load i32, i32* %4
%20 = load i32, i32* %5
%21 = add nsw i32 %20, %19
store i32 %21, i32* %5
%22 = load i32, i32* %4
%23 = add nsw i32 %22, -1
store i32 %23, i32* %4
br label %9
24: ; preds = %9
%25 = load i32, i32* %4
%26 = load i32, i32* %3
%27 = add nsw i32 %26, %25
store i32 %27, i32* %3
%28 = load i32, i32* %4
%29 = load i32, i32* %5
%30 = add nsw i32 %29, %28
store i32 %30, i32* %5
%31 = load i32, i32* %3
%32 = load i32, i32* %5
%33 = sub nsw i32 %31, %32
%34 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %33)
ret i32 0
}

LLVM IR (-O2):
@.str = [5 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 = call i32 @scanf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32* %1, i32* %2)
%6 = load i32, i32* %1
%7 = load i32, i32* %2
%8 = xor i32 %7, -2147483648
%9 = add nsw i32 %8, %6
store i32 %9, i32* %2
%10 = xor i32 %9, -2147483648
%11 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %10)
ret i32 0
}