#include <iostream>
using namespace std;
int e[2000001],a,n,k,i,j;
main(){
	cin>>n>>k;
	for(i=2;n>=i;i++,a+=k<=e[i]+!e[i])for(j=i;n>=j&&!e[i];j+=i)e[j]++;
	cout<<a<<endl;
}