using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = int.Parse(line[0]);
        var b = int.Parse(line[1]);
        var count = 0;
        if (a <= 23 && b >= 23) count++;
        if (a <= 24 && b >= 24) count++;
        if (a <= 25 && b >= 25) count++;
        Console.WriteLine(3 - count);
    }
}