#include <algorithm>
#include <iostream>
#include <numeric>
#include <string>
#include <utility>
#include <vector>

int main() {
  long long n, l;
  std::vector<bool> is_prime(5000001, true);
  long long count = 0;
  std::cin >> n >> l;
  is_prime[0] = is_prime[1] = false;
  for (int p = 2; p <= l; ++p) {
    if (is_prime[p]) {
      for (int k = 2; k * p <= l; ++k) {
        is_prime[k * p] = false;
      }
      count += std::max(0LL, l - (n - 1) * p + 1);
    }
  }
  std::cout << count << std::endl;
  return 0;
}