//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 siz(string s){
  return (int)s.size();
}

int main(){
  int N, K; cin >> N >> K;
  vector<int> X(4e6, 0);
  vector<bool> Era(4e6, true);
  Era[0] = Era[1] = false;

  for(int i = 2; i*i <= 2e6; i++){
    if(!Era[i]) continue;
    X[i]++;

    for(int j = i*2; j <= 2e6; j += i){
      Era[j] = false;
      X[j]++;
    }
  }

  int ans = 0;
  for(int i = 2; i <= N; i++){
    if(K <= X[i]) ans++;
  }

  printl(ans);

  return 0;
}