#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,sum=0,a[310],i=0,j,b=0;
	cin>>n;
	for(int i=0;i<n;i++){
		cin>>a[i];
	}
	j=n-1;
	sort(a,a+n);
	while(i<=j){
		sum+=(a[j]-b)*(a[j]-b);
		b=a[j];
		sum+=(b-a[i])*(b-a[i]);
		b=a[i];
		i++;
		j--;
	}
	cout<<sum;
}