Your task is to Calculate the sum of some integers.

Input contains multiple test cases. Each test case contains a integer N, and then N integers follow in the same line. A test case starting with 0 terminates the input and this test case is not to be processed.

int main()
{
    int a,b;
    while(scanf("%d%d",&a,&b)!=EOF)
    {
         //exit current loop  when a==0 && b== 0
         if(a==0 && b==0)
              break;

         ....
         ....
     }
}