Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func main() {
	io := NewIo()
	defer io.Flush()
	for {
		sum := io.NextInt();
		if sum == 0 {
			break
		}
		for i := 0; i < 9; i++ {
			sum -= io.NextInt()
		}
		io.Println(sum)
	}
}

// I/O template
type Io struct {
	reader    *bufio.Reader
	writer    *bufio.Writer
	tokens    []string
	nextToken int
}

func NewIo() *Io {
	return &Io{
		reader: bufio.NewReader(os.Stdin),
		writer: bufio.NewWriter(os.Stdout),
	}
}

func (io *Io) Flush() {
	err := io.writer.Flush()
	if err != nil {
		panic(err)
	}
}

func (io *Io) NextLine() string {
	var buff []byte
	for {
		line, isPrefix, err := io.reader.ReadLine()
		if err != nil {
			panic(err)
		}
		buff = append(buff, line...)
		if !isPrefix {
			break
		}
	}
	return string(buff)
}

func (io *Io) Next() string {
	for io.nextToken >= len(io.tokens) {
		line := io.NextLine()
		io.tokens = strings.Fields(line)
		io.nextToken = 0
	}
	s := io.tokens[io.nextToken]
	io.nextToken++
	return s
}

func (io *Io) NextInt() int {
	i, err := strconv.Atoi(io.Next())
	if err != nil {
		panic(err)
	}
	return i
}

func (io *Io) NextFloat() float64 {
	i, err := strconv.ParseFloat(io.Next(), 64)
	if err != nil {
		panic(err)
	}
	return i
}

func (io *Io) Println(a ...interface{}) {
	fmt.Fprintln(io.writer, a...)
}

func (io *Io) Printf(format string, a ...interface{}) {
	fmt.Fprintf(io.writer, format, a...)
}

func (io *Io) PrintIntSlice(a []int) {
	b := []interface{}{}
	for _, x := range a {
		b = append(b, x)
	}
	io.Println(b...)
}

func (io *Io) PrintStringSlice(a []string) {
	b := []interface{}{}
	for _, x := range a {
		b = append(b, x)
	}
	io.Println(b...)
}

func Log(name string, value interface{}) {
	fmt.Fprintf(os.Stderr, "%s=%+v\n", name, value)
}

func ExampleIo() {
	io := NewIo()
	defer io.Flush()
	a := make([]int, 0, 3)
	a[0], a[1], a[2] = io.NextInt(), io.NextInt(), io.NextInt()
	io.Println(a)
	io.PrintIntSlice(a)
	Log("io", a)
}

C++: #include <iostream>
using namespace std;
int main(void){
   int a; // Your code here!
    while(true){
        cin >> a;
        if(cin.eof())break;
        if(a==0)continue;
        for(int i = 0;i<9;i++){
            int b;
            cin >> b;
        a=a-b;
        }
        cout << a << endl;
    }
    
}

C++: #include<iostream>
using namespace std;

int main(){
	int m,k;
	cin>>m;
	for(int n=0; n<9; n++ ){
	cin>>k;
	m-=k;
	if(k=0){
		break;
	}
	}
	cout<<m<<endl;
	return 0;
}

C++: #include<iostream>
using namespace std;
int main(){
	int a;
	int sum=0;
	int other=0;
	int i=0;
	
	cin>>sum;
	
	for(i=0;i<9;i++){
		cin>>a;
		other+=a;
	}
	
	int ans;
	ans=sum-other;
	cout<<ans<<endl;
	
}

C++: #include<iostream>
using namespace std;
int main(){
	while(1){
		int n;
		cin>>n;
		if(n==0)break;
		int a[9];
		for(int i=0;i<9;i++){
			cin>>a[i];
			n-=a[i];
		}
		cout<<n<<endl;
	}
}

C++: #include <iostream>
using namespace std;

int main(){
    int all;
    int total;
    int prace;
    while(1){
        total = 0;
        cin >> all;
        if(all == 0) break;
        for(int i=0;i<9;i++){
            cin >> prace;
            total += prace;
        }
        cout << all - total << endl;
    }
}

C++: #include <bits/stdc++.h>
using namespace std;
int n, m;
int main() {
	cin >> n;
	for(int i = 0; i < 9; i++) cin >> m, n -= m;
	cout << n << endl;
	return 0;
}

C++: #include<iostream>
#include<algorithm>
#include<string>
#include<vector>
using namespace std;

int main()
{
	//レシート

	while (true)
	{
		int N;
		cin >> N;
		if (N = 0) break;
		int sum = 0;
		for (int i = 0; i < 9; i++) {
			int a;
			cin >> a;
			sum += a;
		}
		cout << N - sum << endl;
	}

	//コンテスト	
	/*
	int W[10], K[10];
	for (int i = 0; i < 10; i++) {
		cin >> W[i];
	}
	for (int i = 0; i < 10; i++) {
		cin >> K[i];
	}
	sort(W, W + 10);
	reverse(W, W + 10);
	sort(K, K + 10);
	reverse(K, K + 10);
	cout << W[0] + W[1] + W[2] << " " << K[0] + K[1] + K[2] << endl;
	*/
	//ポイントカード
	/*
	int N, M;
	cin >> N >> M;
	int a;
	int A[5000];
	int b = 0;
	int x = 0;
	for (int i = 0; i <  M; i++) {
		cin >> a;
		if (a < N) {
			A[x]=a;
			x++;
		}
		else
		{
			b++;
		} 
		cin >> a;
	}
	int sum = 0;
	if (b < M - 1) {
		sort(A, A+x);
		reverse(A, A+x);
		for (int i = 0; i < M - 1 - b; i++) {
			sum += N - A[i];
		}
	}
	cout << sum << endl;
	*/

	//合計時間
	/*
	int sum=0, n;
	for (int i = 0; i < 4; i++) {
	cin >> n;
	sum += n;
	}
	cout << sum / 60 << endl;
	cout << sum % 60 << endl;
	//平均点
	/*
	int P[5];
	int sum=0;
	for (int i = 0; i < 5; i++) {
	cin >> P[i];
	if (P[i] < 40) P[i] = 40;
	sum += P[i];
	}
	cout << sum / 5 << endl;
	*/
	//投票
	/*
	int N, M;
	cin >> N >> M;
	int A[1000], vote[1000];
	for (int i = 0; i < N; i++) {
	cin >> A[i];
	vote[i] = 0;
	}
	int b;
	for (int i = 0; i < M; i++) {
	cin >> b;
	for (int j = 0; j < N; j++) {
	if (A[j] <= b) {
	vote[j]++;
	break;
	}
	}
	}
	int temps = 0, ans;
	for (int i = 0; i < N; i++) {
	if (vote[i] > temps) {
	temps = vote[i];
	ans = i;
	}
	}
	cout << ans + 1 << endl;
	*/

	//2.すごろく	
	/*
	int n;
	cin >> n;
	int A, _A = 1;
	int k = 0;
	int A_count[100];
	A_count[0] = 1;
	for (int i = 0; i < n; i++)
	{
	cin >> A;
	if (A == 1)
	{
	if (A == _A)
	{
	A_count[k]++;
	}
	else
	{
	k++;
	A_count[k] = 2;
	}
	}
	_A = A;
	}
	sort(A_count, A_count + k + 1);
	cout << A_count[k] << endl;
	*/

	//タイムカード
	/*
	int t[2][3];
	int x[3][3];
	for (int n=0; n < 3; n++)
	{
	for (int i=0; i < 2; i++)
	for (int k=0; k < 3; k++)
	cin >> t[i][k];

	for (int m = 2; m >= 0; m--)
	{
	x[n][m] = t[1][m] - t[0][m];
	if (t[0][m] > t[1][m])
	{
	x[n][m] += 60;
	t[1][m - 1]--;
	}
	}
	}
	for (int n= 0; n < 3; n++)
	{
	cout << x[n][0] << ' ' << x[n][1] <<' '<< x[n][2] << endl;
	}
	*/



	return 0;
}

C++: #include <iostream>
using namespace std;
int main(){
  int n,s=0,p=9,a;
  cin>>n;
  for(int i=0;i<9;i++){
    cin>>a;
    s+=a;
  }
  cout<<n-s<<endl;
}

C++: #include <iostream>

bool solve() {
    int s;
    std::cin >> s;
    if (s == 0) return false;

    for (int i = 0; i < 9; ++i) {
        int x;
        std::cin >> x;
        s -= x;
    }

    std::cout << s << "\n";
    return true;
}

int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    while (solve()) {}

    return 0;
}

C++: #include<cstdio>
#include<algorithm>
using namespace std;

int main(){
  int t;
  int b;
  
  scanf(" %d",&t);
  while(scanf(" %d",&b),b!=0)t -= b;
  
  printf("%d\n",t);
  
  return 0;
}

C++: #include <iostream>

using namespace std;

int main() {
  int total, book;
  while (true) {
    cin >> total;
    if (total == 0) {
      return 0;
    }
    for (int i = 0; i < 9; ++i) {
      cin >> book;
      total -= book;
    }
    cout << total << endl;
  }
}

C++: #include <bits/stdc++.h>
using namespace std;

int main(){

  int books;
  int cnt=0,res;

  cin >> res;

  for(int i = 0; i < 10; i++){
    cin >> books;
    res-=books;
     if(res == 0) break;
     if(i == 9 && books == 0) break;
  }

  //books = res - cnt;
  cout << res << endl;

  return 0;
}

C++: #include<iostream>
using namespace std;

int main()
{
  int a, b, c, d, e, f, g, h, i, j;
  
  cin>>a>>b>>c>>d>>e>>f>>g>>h>>i>>j;
  cout<<a-(b+c+d+e+f+g+h+i+j);

  return 0;
}