#include <bits/stdc++.h>
#define F first
#define S second
#define $ ios::sync_with_stdio(0);
#define endl '\n'
using namespace std;
using ll = long long int;
using ii = pair<ll, ll>;
using vi = vector<int>;
using vii = vector<ii>;
using graph = vector<vi>;
const int INF = 0x3f3f3f3f;
const ll INFL = 0x3f3f3f3f3f3f3f3f;
const int MAXN = 212345;
const ll mod = 1000000007;
int v[MAXN];
int main() {
    int n;
    ll sqs = 0, sum = 0;
    scanf("%d", &n);
    int minor = INF, major = -INF;
    for (int i = 0; i<n; ++i) {
        scanf("%d", v+i);
        sum += v[i];
        sqs += v[i] * v[i];
        if (v[i] < minor) minor = v[i];
        if (v[i] > major) major = v[i];
    }
    ll ans = INFL, aux;
    for (int i = minor; i<=major; ++i) {
        aux = sqs - 2LL*i*sum + n*i*i;
        ans = min(ans, aux);
    }
    printf("%lld\n", ans);

}