#include <bits/stdc++.h>
using namespace std;
int main(){
	long long x1,y1,x2,y2,x3,y3,n,m,h,s = 0,d = 0;
	cin>>x1>>y1>>x2>>y2>>n;
	for(int i = 0;i<n;i++){
		cin>>x3>>y3;
		m = (x1-x3)*(x1-x3)+(y1-y3)*(y1-y3);
		h = (x2-x3)*(x2-x3)+(y2-y3)*(y2-y3);
		if(m>h){
			if(s<h){
				s = h;
			}
		}
		else{
			if(d<m){
				d = m;
			}			
		}
	}
	cout<<s+d;
}