import java.util.*; public class Main { public static void main(String [] args) { Scanner Data = new Scanner(System.in); int n,a; int sum; while(true) { sum=0; n=Data.nextInt(); if(n==0) break; while(n!=0) { a=Data.nextInt(); sum+=a; n--; } System.out.printf("%d\n",sum); } } }