#include "iostream"
#include "list"
#include "math.h"
using namespace std;

int N, L;
list <int>P;
long long int ans;
bool flag;

int main() {
	cin >> N >> L;
	P.push_back(2);
	for (int i = 3; i <= L/(N-1); i+=2) {
		flag = true;
		for (auto j = P.begin()++; j != P.end()&&(*j)<=sqrt(i); ++j) {
			if (i % (*j) == 0) {
				flag = false;
				break;
			}
		}
		if (flag) {
			P.push_back(i);
		}
	}
	for (auto i = P.begin(); i != P.end(); ++i) {
		if (L - (N - 1)*(*i) < 0)break;
		ans += L - (N - 1)*(*i) + 1;
	}
	cout << ans << "\n";
	return 0;
}