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

namespace No407_2{
    public class Program{
        public static void Main(string[] args){
            var sr = new StreamReader();
            //---------------------------------
            var N = sr.Next<long>();
            var L = sr.Next<long>();
            Console.WriteLine(Prime.Sieve((int)L - 1).ToList().Sum(p => Math.Max(L - p * (N - 1) + 1, 0)));
            //---------------------------------
        }
    }

    public class Prime{
        public static bool Is(int n){
            for(var i = 2; i * i <= n; i++) if(n % i == 0) return false;
            return n > 1;
        }

        public static IEnumerable<int> Sieve(int n){
            var sieve = new bool[n + 1];
            for(var i = 2; i <= n; i++){
                if(!sieve[i]){
                    yield return i;
                    for(var j = i << 1; j <= n; j += i) sieve[j] = true;
                }
            }
        }
    }

    public class StreamReader{
        private readonly char[] _c = {' '};
        private int _index = -1;
        private string[] _input = new string[0];

        public T Next<T>(){
            if(_index == _input.Length - 1){
                _index = -1;
                while(true){
                    string rl = Console.ReadLine();
                    if(rl == null){
                        if(typeof(T).IsClass) return default(T);
                        return (T)typeof(T).GetField("MinValue").GetValue(null);
                    }
                    if(rl != ""){
                        _input = rl.Split(_c, StringSplitOptions.RemoveEmptyEntries);
                        break;
                    }
                }
            }
            return (T)Convert.ChangeType(_input[++_index], typeof(T), System.Globalization.CultureInfo.InvariantCulture);
        }
    }
}