package LeetCode;

import java.util.Scanner;

public class Kama_2 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int sum = 0;
        while (sc.hasNextInt()) {
            int n = sc.nextInt();
            if (n == 0) break;
            while (n-- > 0) {
                sum += sc.nextInt();
            }
            System.out.println(sum);
            sum = 0;
        }
    }
}