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() {
    while (true) {
        int sum10;
        cin >> sum10;
        if (sum10 == 0) {
            break;
        }
        int sum9 = 0;
        for (int i = 0; i < 9; i++) {
            int price;
            cin >> price;
            sum9 += price;
        }
        cout << sum10 - sum9 << endl;
    }
}

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

int main()
{
	//レシート

	for(int i=0; i < 5; i++)
	{
		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 total,book;
	int c=0;
	while(true){
	if(c==0){
		cin >> total;	
	}
	if(total==0){
		break;
	}
	c++;
	}else{
	cin >> book ;
	total -= book;
	c++;
	}
	if(c==10){
	cout << total << '\n';
	c=0;
	}
	}	
	return 0;
}

C++: #include <iostream>

using namespace std;

int main(){

	int book , sum;

	while(1){
		cin >> sum;
		if(sum == 0) break;

	for(int i = 0; i < 9; i++){
		cin >> book;
		sum -= book;
	}
	cout << sum << endl;
	}

	return 0;
}

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

#define rep(i,n) for(int i=0;i<n;i++)
#define all(c) (c).begin(),(c).end()
#define mp make_pair
#define pb push_back
#define rp(i,c) rep(i,(c).size())
#define fr(i,c) for(__typeof((c).begin()) i=(c).begin();i!=(c).end();i++)
#define dbg(x) cerr<<#x<<" = "<<(x)<<endl

using namespace std;

typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> pi;
const int inf=1<<28;
const double INF=1e12,EPS=1e-9;

int main()
{
	int sum;
	while(cin>>sum,sum)
	{
		int t;
		rep(i,9)cin>>t,sum-=t;
		cout<<sum<<endl;
	}
	
	return 0;
}

C++: #include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
typedef long long int ll;

int main(){
	while(1){
		int a[10];
		cin >> a[0];
		if(a[0]==0)break;
		for(int i=1;i<10;i++){
			cin >> a[i];
			a[0]-=a[i];
		}
		cout << a[0] << endl;
	}
}

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

int main() {
	int sum;
	cin >> sum;
	for(int i = 0; i < 9; i++) {
		int el;
		cin >> el;
		sum -= el;
	}
	cout << sum << endl;
}

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

int main(){
  int sum,t;
  while(cin >> sum,sum){
  for(int i = 0;i < 9;i++){
    cin >> t;
    sum -= t;
  }
  cout << sum << endl;
  }
  return 0;
}

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

int main() {
	int a[11], i = 1;
	cin >> a[0];
	while (1){	
		cin >> a[i];
		if (a[i] == 0){break;}
		a[0] = a[0] - a[i];
		i++;		
	}
	cout << a[0] << endl;
}

C++: #include <iostream>

using namespace std;

int main() {
  for (;;) {
    int sum;
    cin >> sum;
    if (!sum) break;
    for (int i = 0; i < 9; i++) {
      int p;
      cin >> p;
      sum -= p;
    }
    cout << sum;
  }
  return 0;
}

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

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

int main(void)
{
	int sum;
	while (scanf("%d", &sum), sum){
		int tmp, res = sum;
		for (int i = 0; i < 9; i++){
			scanf("%d", &tmp);
			res -= tmp;
		}
		printf("%d\n", res);
	}
	
	return 0;
}

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

int main(){
	int total;
	int books;

         cin>>total;
	while(true){
		
            cin>>books;
           if(books==0){
              break;
           }
	   total-=books;
	}
	cout<<total;
	return 0;
}

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

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