#include <bits/stdc++.h>

using namespace std;

int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);

	int n;
	cin>>n;

	n*= 4;
	set<pair<int,int> > bylo;
	vector<pair<int,int> > points;

	for(int i =0;i < n; ++i)
	{
		int x,y;
		cin>>x>>y;
		points.emplace_back(x,y);
		bylo.insert(make_pair(x,y));
	}
	
	sort(points.begin(), points.end());
	
	long long res = 0;
	
	for(int i = 0;i < n; ++i)
	{
	
			
			
		int x = points[i].first;
		int y = points[i].second;
		
		
		if(bylo.count(make_pair(x,y)) == 0)
			continue;
		
		int resX, resY;
		
		long long mini = 3e18;
		for(int j= i+1;j < n; ++j)
		{
		
			long long X = points[j].first;
			long long Y = points[j].second;
			
			if(bylo.count(make_pair(X,Y)) == 0)
				continue;
			
			int dX = X-x;
			int dY = Y-y;
			
			int nx = x + dY;
			int ny = y - dX;
			
		
			
			if(bylo.count(make_pair(nx,ny)) == 0)
				continue;
			
				
			nx = X +dY;
			ny = Y - dX;
			
			
			if(bylo.count(make_pair(nx,ny)))
			{
				if((X-x)*(X-x) + (Y-y)*(Y-y) < mini)
				{
					mini = (X-x)*(X-x) + (Y-y)*(Y-y);
					resX = X;
					resY = Y;
				}
			}
		
		}
		
		res += mini;
		bylo.erase(make_pair(x,y));
		bylo.erase(make_pair(resX,resY));
		
		int dX = resX-x;
		int dY = resY - y;
		
		bylo.erase(make_pair(x+dY, y-dX));
		bylo.erase(make_pair(resX+dY, resY - dX));
	}
	
	cout<<res;

	
	
	return 0;
	}