from math import sqrt,ceil,gcd,log;re=lambda:map(int,input().strip().split())
while True:
    a = list(re())
    if a == [0]:
        break
    print(sum(a[1:]))

#include <stdio.h> int main() { int N; while (scanf("%d",&N)&&N!=0){ int m=0; for (int i=1;i<=N;i++) { int a; scanf("%d",&a); m+=a; }

printf("%d\n",m);}

return 0;}