using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static long NN => long.Parse(ReadLine());
    static double[] NList => ReadLine().Split().Select(double.Parse).ToArray();
    static double[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var arr = NArr(n);
        var brr = NArr(n);
        var ax = 0.0;
        var ay = 0.0;
        var bx = 0.0;
        var by = 0.0;
        for (var i = 0; i < n; ++i)
        {
            ax += arr[i][0];
            ay += arr[i][1];
            bx += brr[i][0];
            by += brr[i][1];
        }
        ax /= n;
        ay /= n;
        bx /= n;
        by /= n;
        var amax = 0.0;
        var bmax = 0.0;
        for (var i = 0; i < n; ++i)
        {
            amax = Math.Max(amax, Math.Sqrt((arr[i][0] - ax) * (arr[i][0] - ax) + (arr[i][1] - ay) * (arr[i][1] - ay)));
            bmax = Math.Max(bmax, Math.Sqrt((brr[i][0] - bx) * (brr[i][0] - bx) + (brr[i][1] - by) * (brr[i][1] - by)));
        }
        WriteLine(bmax / amax);
    }
}