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

unsigned long long int N, L;
vector<bool> prime;

int setPrime(int n){
  prime.resize(n+1);
  prime.assign(n+1, 1);

  prime[0] = 0;
  prime[1] = 0;
  prime[2] = 1;

  for(int i=2; i<=n; ++i){
    if(prime[i]==1){
      int j=i*2;
      while(j<=n){
	prime[j] = 0;
	j += i;
      }
    }
  }
}

int main(){
  cin >> N >> L;

  setPrime(L);

  unsigned long long int count = 0;

  for(int i=0; i<=L; ++i){
    if(prime[i]){
      if((N-1)*i<=L){
	count += L - ((N-1)*i) + 1;
      }
    }
  }
  cout << count << endl; 

  return 0;
}