using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static string InputPattern = "InputX";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("245 420");
            //2
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("417 417");
            //0
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("290 300");
            //1
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static long[] GetSplitArr(string pStr)
    {
        return (pStr == "" ? new string[0] : pStr.Split(' ')).Select(pX => long.Parse(pX)).ToArray();
    }

    static void Main()
    {
        List<string> InputList = GetInputList();
        long[] wkArr = GetSplitArr(InputList[0]);
        long L = wkArr[0];
        long R = wkArr[1];

        var LangSet = new HashSet<string>();
        for (long I = L; I <= R; I++) {
            LangSet.Add(GetLang(I));
        }
        Console.WriteLine(LangSet.Count - 1);
    }

    static string GetLang(long pNo)
    {
        if (1 <= pNo && pNo <= 295) return "C++";
        if (296 <= pNo && pNo <= 416) return "Rust";
        return "Python";
    }
}