#include<bits/stdc++.h>
using namespace std;

vector<long long> primes;

void sieve(long long n){
  vector<bool> isPrime(n, true);
  isPrime[0] = false;
  isPrime[1] = false;
  long long maxn = sqrt(n);
  for(long long i = 2; i <= n; i++){
    if(isPrime[i] == true){
      primes.push_back(i);
      for(long long j = i * 2; j <= n; j += i){
        isPrime[j] = false;
      }
    }
  }
}

int main(){
  long long n, l;
  cin >> n >> l;
  sieve(l);
  long long count = 0;
  for(long long i = 0; i < primes.size(); i++){
//    cout << primes[i] << endl;
    if(primes[i] * (n - 1) <= l){
      count += (l + 1) - (primes[i] * (n - 1));
    }

  }
  cout << count << endl;
}