计蒜客 情人节表白

 

 

 

#include<iostream>
#include<cstdio>
using namespace std;
int main()
{

    int n;
    while(scanf("%d",&n),n){
        int x,sum=0;
        for(int i=0;i<n;++i)
        {
            scanf("%d",&x);
            sum+=x*x;
        }
        printf("%d\n",sum);
            
    }
    return 0;

}