AtCoder Be Together

//#include<stdio.h>
//#include<iostream>
//#include<algorithm>
//#include<vector>
//#include<cstring>
//#include<cmath>
//#include<map>
#include<bits/stdc++.h>
using namespace std;

#define fast ios_base::sync_with_stdio(false)
#define outs(x) cout << x << " "
#define outn(x) cout << x << "\n"
#define sf scanf
#define pf printf

typedef long long LL;
typedef vector<int>vii;
typedef vector<LL>vll;

int main()
{
    fast;

    int n;
    vii v;
    while(cin >> n)
    {
        v.clear();

        int i=0 , x;

        for(; i<n; i++)
        {
            cin >> x;
            v.push_back(x);
        }

        LL mxe = *max_element(v.begin(), v.end()) , mini = 1000000000 ,sum=0 , df=0;
        //cout << mxe << "\n";
        LL tmini = mini;
        int  j=0 ;

        for(i=-101; i<=100; i++)
        {
            sum=0;

            for(j=0; j<n; j++)
            {
                df = i > v[j] ? i - v[j] : v[j] - i ;

                sum+=(df * df);
            }

            mini = min(mini, sum);
        }


       // if(mini == tmini) mini = 0;

        cout << mini << "\n";
    }

    return 0;
}