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>
#include<algorithm>
#include<string>
#include<vector>
using namespace std;

int main()
{
	//レシート

	int N;
	int sum = 0;
	int ans[5];
	for(int i=0; i<5; i++)
	{
		cin >> N;
		if (N = 0) break;
			int a;
		for (int j = 0; j < 9; j++) {
			cin >> a;
			sum += a;
		}
		ans[i] = N - sum;
	}
	for (int i = 0; i < 5; i++) {
		cout << ans[i] << 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<cstdio>
main(){int s,p,i;while(scanf("%d",&s),s){for(i=9;i--;s-=scanf("%d",&p)*p);printf("%d\n",s);}}

C++: #include<cstdio>
using namespace std;
int main(void)
{
	int i,j,x,kin,gou;
	scanf("%d",&gou);
	x=0;
	while(1){
		scanf("%d",&kin);
		x+=kin;
		if(kin==0){
			break;
		}
		
	}
	gou=gou-x;
	printf("%d\n",gou);
	return 0;
}

C++: #include <cstdio>

int main()
{
	int N, A;

	scanf("%d", &N);

	for (int i = 0; i < 9; i++)
	{
		scanf("%d", &A);

		N -= A;
	}

	printf("%d\n", N);

	return 0;
}

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

int main() {
	while (1) {
		int book, num[9];
		cin >> book;
		if (book == 0) {
			break;
		}
		for (int i = 0; i < 9; i++) {
			cin >> num[i];
			book = book - num[i];
		}
		cout << book << endl;
	}
	return 0;
}

C++: #include<bits/stdc++.h>

#define lp(i,n) for(int i=0;i<n;i++)
#define lpin(a,i,n) for(int i=0;i<n;i++){cin>>a[i];}
using namespace std;

int main(){
  while(1){
    int a;
    cin>>a;
    if(a==0) break;
    lp(i,9){
      int b;
      cin>>b;
      a-=b;
    }
    cout<<a<<endl;
  }
  return 0;
}

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


int main(){
int i,a,t;
cin>>a;
while(t<9){
    cin>>i;
     if((i==0)||(a==0))
           break;
     else a=a-i;
t++;
}
cout<<a<<'\n';
 return 0;

}

C++: #include<stdio.h>
int main(void)
{
	int ss,s,a,b,i;
	while(1) {
		scanf("%d",&b);
		if(b==0){
			break;
		}
		for(i=0;i<9;i++){
			scanf("%d",&a);
			s+=a;
		}	
	ss=b-s;
	printf("%d\n",ss);
	}
	return 0;
	
}

C++: #include<bits/stdc++.h>
using namespace std;
int main(){
  int n,t,ans=0;
  while(1){
  ans = 0;
  cin >> t;
  if(t==0) break;
  for(int i=0; i<9; i++){
	cin >> n;
	ans += n;
  }
  if(t==0){
  } else {
  cout << t-ans << endl;
  }
  }
  return 0;
}

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

int main(){

int num;
int i =1;

while(1){
 cin>>num; 
 
  while(1){
  if(i==0){
   i = 1;
    break;
  }else{
   cin>>i;
   num=num-i;
   }
 }
 cout<<num<<'\n';
}

return 0;
}

C++: #include <iostream>

using namespace std;

int main() {

  int sum;
  int price[10];

  int rest;

  
  while(1) {

    cin >> sum;

    if(sum==0) break;

    for(int i=0;i<9;i++) cin >> price[i];

    rest=sum;

    for(int i=0;i<9;i++) rest-=price[i];

    cout << rest << endl;

  }

  return 0;

}

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

int main(){
	int total;
	int books;

	for(int i=0;i<10;i++){
		if(i==0){
                   cin>>total;
                   if(total>10000){
                      break;
                   }
                }else{
                   cin>>books;
                   if(books==0){
                      cout<<total;
                      break;
                   }
                   total-=books;
                }
	}
	
	return 0;
}

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

C++: #include<cstdio>
using namespace std;
int main(void)
{
	int i,x=0,kin,gou,sa;
	
	while(1){
		scanf("%d",&gou);
			for(i=0;i<9;i++){
				scanf("%d",&kin);
				x+=kin;
			}
			sa=gou-x;
			printf("%d\n",sa);
			break;
	}
	return 0;
}