using System;
using System.Collections;
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 - 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);
            for(var i = 2; i <= sqrt; i++) {
                if(n % i == 0) {
                    return false;
                }
            }
            return true;
        }

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

            for(var i = 2; i <= sqrt; i++) {
                if(!sieve[i]) {
                    yield return i;
                    for(var j = i + i; j <= n; j += i) {
                        sieve[j] = true;
                    }
                }
            }

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

    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;
        }
    }
}