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(){

  int s;
  while(cin >> s, s){
    
    for(int i=0;i<9;i++){
      int k;
      cin >> k;
      s -= k;
    }

    cout << s << endl;
  }

}

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

int main(){
	int total;
	int books;

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

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

int main()
{
	int total;
	cin >> total; //初回の総額入力

		while(total != 0){
		//読み取れなかった価格の計算
		int a,b,c,d,e,f,g,h,i;
		cin >> a >> b >> c >> d >> e >> f >> g >> h >> i;
		cout << total-(a+b+c+d+e+f+g+h+i);
		cin >> total;//2回目以降の総額の入力
		}
	return 0;
}

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

int main(void){
	while(1){
		int n;
		cin>>n;
		if(n == 0) break;
		for(int i=0;i<9;i++){
			int m;
			cin>>m;
			n -= m;
		}
		cout<<n<<endl;
	}

	return 0;
}