#include<iostream>
using namespace std;
int main()
{
int n;
while(cin>>n&&n!=0)
{
int sum=0;
for(int i=1;i<=n;i++)
{
int a;
cin>>a;
sum+=a;
}
cout<<sum<<endl;
}
}
#include<iostream>
using namespace std;
int main()
{
int n;
while(cin>>n&&n!=0)
{
int sum=0;
for(int i=1;i<=n;i++)
{
int a;
cin>>a;
sum+=a;
}
cout<<sum<<endl;
}
}