//Normal

#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

void print(auto a){
  cout << a;
}

void prints(auto a){
  cout << a << " ";
}

void prints(){
  cout << " ";
}

void printl(auto a){
  cout << a << endl;
}

void printl(){
  cout << endl;
}

void fix(int n){
  cout << fixed << setprecision(n);
}

int main(){
  vector<ll> X(1e7, 0); 
  int A, N, K, I, J; cin >> N >> K;

  for(I = 2; I <= N; I++, A += K <= X[I] + !X[I]){
    if(!X[I]){
      for(J = I; J <= N; J += I){
        X[J]++;
      }
    }
  }

  printl(A);

  return 0;
}