/*ID: wushuai2PROG: skidesignLANG: C++*///#pragma comment(linker, "/STACK:16777216") //for c++ Compiler#include <stdio.h>#include <iostream>#include <fstream>#include <cstring>#include <cmath>#include <stack>#include <string>#include <map>#include <set>#include <list>#include <queue>#include <vector>#include <algorithm>#define Max(a,b) (((a) > (b)) ? (a) : (b))#define Min(a,b) (((a) < (b)) ? (a) : (b))#define Abs(x) (((x) > 0) ? (x) : (-(x)))#define MOD 1000000007#define pi acos(-1.0)using namespace std;typedef long long           ll      ;typedef unsigned long long  ull     ;typedef unsigned int        uint    ;typedef unsigned char       uchar   ;template<class T> inline void checkmin(T &a,T b){if(a>b) a=b;}template<class T> inline void checkmax(T &a,T b){if(a<b) a=b;}const double eps = 1e-7      ;const int M = 200000         ;const ll P = 10000000097ll   ;const int INF = 0x3f3f3f3f   ;const int MAX_N = 20         ;int a[1011];int main() {    ofstream fout ("skidesign.out");    ifstream fin ("skidesign.in");    int i, j, k, t, n, m, s, c, w, q;    fin >> n;    int Min = INF, Max = -INF;    int ans = INF;    for(i = 0; i < n; ++i){        fin >> a[i];        checkmax(Max, a[i]);        checkmin(Min, a[i]);    }    for(int low = Min; low < Max; ++low){        for(int high = low + 1; high <= Max; ++high){            if(Abs(high - low) <= 17){                int cur = 0;                for(i = 0; i < n; ++i){                    if(a[i] < low){                        cur += (low - a[i]) * (low - a[i]);                    } else if(a[i] > high){                        cur += (a[i] - high) * (a[i] - high);                    }                }                checkmin(ans, cur);            }        }    }    fout << ans << endl;    fin.close();    fout.close();    return 0;}