/*

     PROB:skidesign

     ID:wanghan

     LANG:C++

 */

 #include "iostream"

 #include "cstdio"

 #include "cstring"

 #include "algorithm"

 #include "cmath"

 using namespace std;

 const int maxn=+;

 const int INF=<<;

 int a[maxn];

 int n;

 int main()

 {

     freopen("skidesign.in","r",stdin);

     freopen("skidesign.out","w",stdout);

     cin>>n;

     for(int i=;i<=n;i++)

         cin>>a[i];

     int res=INF;

     for(int  i=;i<=-;i++){

         int ans=;

         for(int j=;j<=n;j++){

             if(a[j]>=i&&a[j]<=i+){

             }else{

                 int num=min(abs(i-a[j]),abs(i+-a[j]));

                 ans+=num*num;

             }

         }

         res=min(ans,res);

     }

     cout<<res<<endl;

 }