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];
	int k =0 ;
	while (true)
	{
		cin >> N;
		if (N = 0) break;
			int a;
		for (int j = 0; j < 9; j++) {
			cin >> a;
			sum += a;
		}
		ans[k] = N - sum;
		k++;
	}
	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<stdio.h>

int main(void){
	int N,i,k;

	while(0){
		scanf("%d",&N);
		if(N==0)break;
		for(i=0;i<9;i++){
			scanf("%d",&k);
			N-=k;
		}
		printf("%d\n",N);
	}
	return 0;
}

C++: #include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<cassert>
#include<iostream>
#include<sstream>
#include<string>
#include<vector>
#include<queue>
#include<set>
#include<map>
#include<utility>
#include<numeric>
#include<algorithm>
#include<bitset>
#include<complex>

using namespace std;

typedef long long Int;
typedef vector<int> vint;
typedef pair<int,int> pint;
#define mp make_pair

template<class T> void pv(T a, T b) { for (T i = a; i != b; ++i) cout << *i << " "; cout << endl; }
template<class T> void chmin(T &t, T f) { if (t > f) t = f; }
template<class T> void chmax(T &t, T f) { if (t < f) t = f; }
int in() { int x; scanf("%d", &x); return x; }

int main() {
	int n;
	int i;
	while(n=in()){
		for(i=0;i<9;i++){
			n-=in();
		}
		cout<<n<<endl;
	}
	return 0;
}

C++: #include<stdio.h>

int main()
{
	int total;
	int sum = 0;
	int a;
	
	for(;;){
		scanf("%d",&total);
		if(total == 0){
			break;
		}
		
		for(int i = 0; i < 9; i++){
			scanf("%d",&a);
			sum += a;
		}
		
		printf("%d\n",total - sum);
	}
	return 0;
}

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

using namespace std;

int main(){
while(1){

	int n=0,ans;
	int t;
	cin >> ans;
	if(ans == 0)break;
	for(int i = 0;i < 9;i++)cin>>t,n+=t;
	cout << ans - n << endl;
}
	return 0;
}

C++: #include <stdio.h>

int total, a[10];

int main(void) {
	scanf("%d", &total);
	for (int i = 0; i < 9; ++i) { scanf("%d", &a[i]); }

	for (int i = 0; i < 9; ++i) { total -= a[i]; }

	printf("%d\n", total);
	return 0;
}

C++: #include<iostream>
using namespace std;
int a,b;
int main(){
	while(true){
		cin>>a;if(a==0)break;
		for(int i=0;i<9;i++){cin>>b;a-=b;}
		cout<<a<<endl;
	}
	return 0;
}

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

int main(){

  int books;
  int cnt=0,res;

  cin >> res;

  for(int i = 0; i < 9; i++){
    cin >> books;
    cnt+=books;
    //    if(i == 9) break;
  }

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

  return 0;
}

C++: a

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

int main(){
	while(1){
		int n, a;
		cin >> n;
		if(n==0) break;
		for(int i=0; i<9; ++i){
			scanf(" %d", &a);
			n-=a;
		}
	
		printf("%d\n", n);
	}
	return 0;
}

C++: #include<stdio.h>

int main()
{
	int total;
	int sum = 0;
	int a;
	
	for(;;){
		total = 0;
		sum = 0;
		scanf("%d",&total);
		if(total == 0){
			break;
		}
		
		for(int i = 0; i < 9; i++){
			scanf("%d",&a);
			sum += a;
		}
		
		printf("%d\n",total - sum);
	}
	return 0;
}

C++: #include <iostream>
using namespace std;
int main(){
int a;
int ans;
cin>>a;
ans=a;
int b;
while(cin>>b){
if(b==0)
	break;
ans=a-b;
a=ans;}
cout<<ans<<endl;
return 0;
}

C++: #include <cstdio>

int main()
{
while(true) {
int n;
scanf("%d", &n);
if(n == 0)
break;
for(int i = 0; i < 9; ++i) {
int t;
scanf("%d", &t);
n -= t;
}
printf("%d\n", n);
}
return 0;
}

C++: #include<iostream>
using namespace std;
int main(){

int total;
cin>>total;
int a=0;

for(int i=1;i<=9;i++){
cin<<a;
a=a+a;
}

cout<<total-a<<"\n";

return 0;
}

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