import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class Main {
		static int INF = 2 << 27;
		public static void main(String[] args) {
			Scanner sc = new Scanner(System.in);
			long N = sc.nextInt();
			long L = sc.nextInt();
			
			List<Integer> l = makePrimeList(L);
			long sum = 0;
			for(int i = 0; i < l.size(); i++) {
				long len = (N-1) * (long)l.get(i);
				if(len > L) break;
				sum += L - len+1;
			}
			System.out.println(sum);
			
			
		}
		
		static List<Integer> makePrimeList(long max) {
			List<Integer> ret = new ArrayList<>();
			boolean[] isntPrime = new boolean[(int)max+1];
			ret.add(2);
			for(int i = 3; i <= max; i += 2) {
				if(!isntPrime[i]) {
					ret.add(i);
					for(int j = i + i ; j <= max; j += i) {
						isntPrime[j] = true;
					}
				}
			}
			return ret;
		}
		

}