#include <bits/stdc++.h>
using namespace std;
struct missile
{
    int la,lb;  
}a[100010];
bool cmp(missile a,missile b)
{
    return a.la<b.la;
}
int main()
{
    int xa,xb,ya,yb,n;
    cin>>xa>>ya>>xb>>yb>>n;
    for(int i=1;i<=n;i++)
    {
        int x,y;
        scanf("%d %d",&x,&y);
        a[i].la=(x-xa)*(x-xa)+(y-ya)*(y-ya);
        a[i].lb=(x-xb)*(x-xb)+(y-yb)*(y-yb);
    }
    sort(a+1,a+n+1,cmp);
    int ans=a[n].la;
    int maxb=0;
    for(int i=n-1;i>=1;i--)
    {
        if(maxb<a[i+1].lb) maxb=a[i+1].lb;
        ans=min(ans,a[i].la+maxb);
    }
    cout<<ans;
    return 0;
}