#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 main() {
  int monthly;
  scanf("%d", &monthly);
  int n;
  scanf("%d", &n);
  int total = 0, i;
  for (i = 0; i < n; i++) {
    int next;
    scanf("%d", &next);
    total += next;
  }
  printf("%d\n", (n + 1) * monthly - total);
  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
call   1040 <scanf@plt>
lea    0xeba(%rip),%rdi
lea    -0xc(%rbp),%rsi
call   1040 <scanf@plt>
movl   $0x0,-0x10(%rbp)
movl   $0x0,-0x14(%rbp)
mov    -0x14(%rbp),%eax
cmp    -0xc(%rbp),%eax
jge    1190 <main+0x70>
lea    0xe90(%rip),%rdi
lea    -0x18(%rbp),%rsi
call   1040 <scanf@plt>
mov    -0x18(%rbp),%eax
add    -0x10(%rbp),%eax
mov    %eax,-0x10(%rbp)
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    115d <main+0x3d>
mov    -0xc(%rbp),%esi
add    $0x1,%esi
imul   -0x8(%rbp),%esi
sub    -0x10(%rbp),%esi
lea    0xe5f(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %rbx
sub    $0x18,%rsp
lea    0xecf(%rip),%rbx
lea    0x14(%rsp),%rsi
mov    %rbx,%rdi
call   1040 <scanf@plt>
lea    0xc(%rsp),%rsi
mov    %rbx,%rdi
call   1040 <scanf@plt>
mov    0xc(%rsp),%esi
test   %esi,%esi
jle    118c <main+0x6c>
xor    %ebx,%ebx
lea    0xea4(%rip),%r14
lea    0x10(%rsp),%r15
xor    %ebp,%ebp
cs nopw 0x0(%rax,%rax,1)
nopl   (%rax)
mov    %r14,%rdi
mov    %r15,%rsi
call   1040 <scanf@plt>
add    0x10(%rsp),%ebp
add    $0x1,%ebx
mov    0xc(%rsp),%esi
cmp    %esi,%ebx
jl     1170 <main+0x50>
jmp    118e <main+0x6e>
xor    %ebp,%ebp
add    $0x1,%esi
imul   0x14(%rsp),%esi
sub    %ebp,%esi
lea    0xe64(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x18,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
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
%4 = alloca i32
%5 = alloca i32
%6 = alloca i32
store i32 0, i32* %1
%7 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %2)
%8 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %3)
store i32 0, i32* %4
store i32 0, i32* %5
br label %9
9: ; preds = %18, %0
%10 = load i32, i32* %5
%11 = load i32, i32* %3
%12 = icmp slt i32 %10, %11
br i1 %12, label %13, label %21
13: ; preds = %9
%14 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %6)
%15 = load i32, i32* %6
%16 = load i32, i32* %4
%17 = add nsw i32 %16, %15
store i32 %17, i32* %4
br label %18
18: ; preds = %13
%19 = load i32, i32* %5
%20 = add nsw i32 %19, 1
store i32 %20, i32* %5
br label %9
21: ; preds = %9
%22 = load i32, i32* %3
%23 = add nsw i32 %22, 1
%24 = load i32, i32* %2
%25 = mul nsw i32 %23, %24
%26 = load i32, i32* %4
%27 = sub nsw i32 %25, %26
%28 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %27)
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 = alloca i32
%3 = alloca i32
%4 = bitcast i32* %1 to i8*
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %1)
%6 = bitcast i32* %2 to i8*
%7 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %2)
%8 = load i32, i32* %2
%9 = icmp sgt i32 %8, 0
br i1 %9, label %10, label %21
10: ; preds = %0
%11 = bitcast i32* %3 to i8*
br label %12
12: ; preds = %10, %12
%13 = phi i32 [ 0, %10 ], [ %18, %12 ]
%14 = phi i32 [ 0, %10 ], [ %17, %12 ]
%15 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %3)
%16 = load i32, i32* %3
%17 = add nsw i32 %16, %14
%18 = add nuw nsw i32 %13, 1
%19 = load i32, i32* %2
%20 = icmp slt i32 %18, %19
br i1 %20, label %12, label %21
21: ; preds = %12, %0
%22 = phi i32 [ 0, %0 ], [ %17, %12 ]
%23 = phi i32 [ %8, %0 ], [ %19, %12 ]
%24 = add nsw i32 %23, 1
%25 = load i32, i32* %1
%26 = mul nsw i32 %25, %24
%27 = sub nsw i32 %26, %22
%28 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %27)
ret i32 0
}