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

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NList;
        var p = - n[2] / 2.0 / n[0];
        var q = - n[3] / 2.0 / n[0];
        var r = (double)(n[5] - n[4]) / n[0] + p * p + q * q;
        WriteLine(Math.Sqrt(r));
    }
}