using System;

namespace No773_contest
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] input = Console.ReadLine().Split(' ');
            int a = int.Parse(input[0]);
            int b = int.Parse(input[1]);
            int day = 0;

            if (a <= 25 && a > 23)
                day += a - 23;
            if (b >= 23 && b < 25)
                day += 25 - b;
            if (a > 25 || b < 23)
                day = 3;

            Console.WriteLine(day);
        }
    }
}