学步园

#include<iostream>
#include<string>
using namespace std;

int main(){
	int a, b;
	int total;
	while(cin>>a && a != 0){
		total = 0;
		for(int i = 0; i < a; i++){
			cin>>b;
			total += b;
		}
		cout<<total<<endl;
	}
}