using System;
using System.IO;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Numerics;
using System.Diagnostics;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using static System.Math;

class P
{
    static void Main()
    {
        var ab = Console.ReadLine().Split().Select(int.Parse).ToList();
        Console.WriteLine((ab[0] <= 23 && 23 <= ab[1] ? 0 : 1) + (ab[0] <= 24 && 24 <= ab[1] ? 0 : 1) + (ab[0] <= 25 && 25 <= ab[1] ? 0 : 1));
    }
}