using System;
using System.Collections.Generic;
using System.Linq;
    class Program
    {
        const int START_DAY = 23;
        const int DAY_COUNT = 3; // 23 ~ 25

        static IEnumerable<int> enumerator = Enumerable.Range(START_DAY, DAY_COUNT);
        static void Main(string[] args)
        {

            var days = Console.ReadLine().Split(' ');
            var start = int.Parse(days[0]);
            var end = int.Parse(days[1]);
            var enumerator2 = Enumerable.Range(start, (end - start) + 1);
            enumerator = enumerator.Except(enumerator2);
            Console.WriteLine(enumerator.Count());
        }
    }