1 #include <iostream>
 2 using namespace std;
 3 int main() {
 4     int n;
 5     while(cin >> n && n != 0)
 6     {
 7         int sum = 0;
 8         int temp;
 9         for(int i = 1; i <= n; i++)
10         {
11             cin >> temp;
12             sum += temp;
13         }
14         cout << sum << endl;
15     }
16     return 0;
17 }