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


class Magatro
{
    static int N,L;
    static Scanner sc = new Scanner();
    static int[] Primes;
 static void Main()
    {
        N = sc.NextInt();
        L = sc.NextInt();
        int[] Primes = PrimeCalc(5000000);
        long ans = 0;
        for(int i = 0; i < Primes.Length; i++)
        {
            int q = Primes[i] * (N - 1);
            if (L>=q)
            {
                ans += (L - q + 1);
            }
            else
            {
                break;
            }
        }
        Console.WriteLine(ans);
    }
    static int[] PrimeCalc(int max)
    {
        int loop = (int)Math.Sqrt(max);
        bool[] num = new bool[max + 1];
        num[0] = true;
        num[1] = true;
        for(int i = 2 * 2; i <= max; i += 2)
        {
            num[i] = true;
        }
        for(int i = 3; i <= loop; i += 2)
        {
            if (!num[i])
            {
                for(int j = i + i; j <= max; j += i)
                {
                    num[j] = true;
                }
            }
        }
        List<int> res = new List<int>();
        res.Add(2);
        for(int i = 3; i <= max; i += 2)
        {
            if (!num[i])
            {
                res.Add(i);
            }
        }
        return res.ToArray();
    }
}

public class Scanner
{
    private string[] S;
    private int Index;
    private char Separator;
    public Scanner(char separator=' ')
    {
        Index = 0;
        Separator = separator;
    }
    public string Next()
    {
        string result;
        if (S == null || Index >= S.Length)
        {
            S = Line();
            Index = 0;
        }
        result = S[Index];
        Index++;
        return result;
    }
    private string[] Line()
    {
        return Console.ReadLine().Split(Separator);
    } 
    public int NextInt()
    {
        return int.Parse(Next());
    }
    public double NextDouble()
    {
        return double.Parse(Next());
    }
    public long NextLong()
    {
        return long.Parse(Next());
    }
}