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>();

            if(L == 1){
                Console.WriteLine(0);
                return;
            }

            Console.WriteLine(Prime.Sieve((int)(L / (N - 1))).Sum(p => Math.Max(L - p * (N - 1) + 1, 0)));
            //---------------------------------
        }
    }

    public class Prime{
        public static bool Is(int n){
            var sqrt = (int)Math.Sqrt(n);

            if(n != 2 && n % 2 == 0){
                return false;
            }

            for(var i = 3; i <= sqrt; i += 2){
                if(n % i == 0){
                    return false;
                }
            }

            return true;
        }

        public static IEnumerable<int> Sieve(int n){
            var size = (n + 1) >> 1;
            var sieve = new bool[size];
            var sqrt = (int)Math.Sqrt(n);

            if(n >= 2){
                yield return 2;
            }

            for(var i = 1; i < sqrt; i++){
                if(!sieve[i]){
                    var d = (i << 1) + 1;
                    yield return d;
                    for(var j = i + d; j < size; j += d){
                        sieve[j] = true;
                    }
                }
            }

            for(var i = sqrt; i < size; i++){
                if(!sieve[i]){
                    yield return (i << 1) + 1;
                }
            }
        }
    }

    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);
        }

        public T[] Next<T>(int x){
            var ret = new T[x];
            for(var i = 0; i < x; ++i) ret[i] = Next<T>();
            return ret;
        }

        public T[][] Next<T>(int y, int x){
            var ret = new T[y][];
            for(var i = 0; i < y; ++i) ret[i] = Next<T>(x);
            return ret;
        }
    }
}