#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n, sum = 0;
    cin >> n;
    for (int i = 1; i <= n; i++)
    {
        int x;
        cin >> x;
        sum += x * x;
    }
    cout << sum;
    return 0;
}

#include <bits/stdc++.h>
using namespace std;
int n, a[105], sum;
int main()
{
    cin >> n;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i];
        sum += a[i] * a[i];
    }
    cout << sum;
    return 0;
}

#include <iostream>//hetao3097453
using namespace std;
int a[101];
int main()
{
    int n,sum = 0;
    cin >> n;
    for(int i = 1;i <= n;i++)
    {
        cin >> a[i];
    }
    for(int i = 1;i <= n;i++)
    {
        sum += a[i] * a[i];
    }
    cout << sum << endl;
    return 0;
}