//P4995 跳跳！
#include<iostream>
#include<algorithm>
#include<cstring>
#include<string>
#define ll long long
using namespace std;
ll a[9999999],b[9999999],ans;
ll n,m;
int main(){
    cin>>n;
    for(ll i=1;i<=n;i++){
        cin>>a[i];
    }
    sort(a+1,a+m+1);
    ll ans=0;
    for(int i=1;i<=n;i++){
        ans+=(a[i]-a[i-1])*(a[i]-a[i-1]);
    }
    cout<<ans;
    return 0;
}