import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int length = sc.nextInt();
        boolean[] isNotPrime = new boolean[length / 2 + 2];
        long ans = 0;
        for (int i = 2; i < isNotPrime.length && i * (n - 1) <= length; i++) {
            if (!isNotPrime[i]) {
                ans += length - i * (n - 1) + 1;
                for (int j = 2; j  * i < isNotPrime.length; j++) {
                    isNotPrime[j * i] = true;
                }
            }
        }
        System.out.println(ans);
    }
}

class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}