import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;

public class Main {

    static BufferedReader in;
    static PrintWriter out;
    static StringTokenizer tok;

    void solve() throws IOException {
        int n = ni();
        int l = ni();

        cprime();

        long ans = 0;

        for (int i = 0; i < 1000000; i++) {
            if (prime[i] * (n - 1) > l) {
                break;
            }

            ans += l - prime[i] * (n - 1) + 1;
        }

        out.println(ans);
    }

    int prime_max = 4000000;
    int pidx = 0;
    long[] prime = new long[1000000];
    int[] divp = new int[prime_max];

    void cprime() {
        for (long i = 2; i < prime_max; i++) {
            if (divp[(int)i] == 0) {
                prime[pidx++] = (int)i;
                for (long j = i * i; j < prime_max; j += i) {
                    divp[(int)j] = (int)i;
                }
            }
        }
    }

    String ns() throws IOException {
        while (!tok.hasMoreTokens()) {
            tok = new StringTokenizer(in.readLine(), " ");
        }
        return tok.nextToken();
    }

    int ni() throws IOException {
        return Integer.parseInt(ns());
    }

    long nl() throws IOException {
        return Long.parseLong(ns());
    }

    double nd() throws IOException {
        return Double.parseDouble(ns());
    }

    String[] nsa(int n) throws IOException {
        String[] res = new String[n];
        for (int i = 0; i < n; i++) {
            res[i] = ns();
        }
        return res;
    }

    int[] nia(int n) throws IOException {
        int[] res = new int[n];
        for (int i = 0; i < n; i++) {
            res[i] = ni();
        }
        return res;
    }

    long[] nla(int n) throws IOException {
        long[] res = new long[n];
        for (int i = 0; i < n; i++) {
            res[i] = nl();
        }
        return res;
    }

    public static void main(String[] args) throws IOException {
        in = new BufferedReader(new InputStreamReader(System.in));
        out = new PrintWriter(System.out);
        tok = new StringTokenizer("");
        Main main = new Main();
        main.solve();
        out.close();
    }
}