import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int L = sc.nextInt();
        int dlim = L/(N-1);
        boolean [] b = new boolean [dlim+1];
        long count=0L;
        if(dlim>=2){
            count+=L-2*(N-1)+1;
        }
        for(int i=3; i<=dlim; i+=2){
            if(b[i]==false){
                count+=L-i*(N-1)+1;
                int k=2;
                while(i*k<=dlim){
                    b[i*k]=true;
                    k++;
                }
            }
        }
        System.out.println(count);
    }
}