#include <iostream>
using namespace std;

int main(){
	int n, k;
	cin >> n >> k;
	int ans = 0, puni[n + 1]{};
	for(int i = 2; i <= n; i++){
		if(puni[i] == 0){
			for(int j = 2 * i; j <= n; j += i) puni[j]++;
			puni[i]++;
		}
		if(k <= puni[i]) ans++;
	}
	cout << ans << endl;
}