#include <iostream>
#include <vector>
#include <iomanip>
#include <algorithm>
#include <cmath>
using namespace std;
using ll = long long;

ll n, l;
int main()
{
  cin >> n >> l;
  vector<ll> prime;
  vector<bool> is_prime(10000010, true);
  for (ll i = 2; i < l; ++i)
  {
    if (is_prime[i])
    {
      prime.push_back(i);
      for (ll j = i + i; j < l; j += i)
      {
        is_prime[j] = false;
      }
    }
  }

  ll ans = 0;
  for (int p : prime)
  {
    ll all = p * ~-n;
    if (all <= l)
    {
      ans += l - all + 1;
    }
  }
  cout << ans << endl;
  return 0;
}