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 p = NList;
        var ans = 0;
        for (var i = p[0]; i <= p[1]; ++i) for (var j = p[2]; j <= p[3]; ++j) ans = Math.Max(ans, (i + j) % p[4]);
        WriteLine(ans);
    }
}