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


class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        int[] inpt = Reader.ReadLine().Split(' ').Select(a => int.Parse(a)).ToArray();
        int kamoCount = inpt[0];
        int maxX = inpt[1];
        int[] primeList = this.GetPrimeNumbers(maxX);

        long ans = 0;
        for (int i = 0; i < primeList.Length; i++)
        {
            int prime = primeList[i];
            long pos = ((long)kamoCount - 1) * prime;
            if (pos > maxX)
            {
                break;
            }

            ans += (maxX - (pos) + 1);
        }
        Console.WriteLine(ans);


    }

    private int[] GetPrimeNumbers(int max)
    {
        bool[] flag = new bool[max + 1];
        List<int> ans = new List<int>();
        for (int i = 2; i < flag.Length; i++)
        {
            if (!flag[i])
            {
                ans.Add(i);
                for (int j = 1; j <= max / i; j++)
                {
                    flag[i * j] = true;
                }
            }

        }
        return ans.ToArray();
    }


    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"


8 964853






";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}