C :

#include <stdio.h>
main()
{
  int n,a,sum;
  
  while(scanf("%d",&n)&&n)
   {
       sum=0;
         while(n--)
       { 
         scanf("%d",&a);
         sum+=a;
       }
    printf("%d\n",sum);
   }
return 0;
}

C++ :

#include <iostream>
#include <cstdio>

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

Java :

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		final int MAX=1024;
		int j = 0;
		@SuppressWarnings("resource")
		Scanner in = new Scanner(System.in);
		int flag;
		int[] a =new int[MAX];
		int[] count = new int[MAX];
		flag = in.nextInt();
		while(flag != 0){
			for(int i =0;i<flag;i++){
				a[i] = in.nextInt();
				count[j]+=a[i];
			}
			j++;
			flag = in.nextInt();
		}
		for(int k = 0;k < j;k++){
			System.out.println(count[k]);
		}
	}
}