#include <bits/stdc++.h>
using namespace std;
int a[1000005];
int main(){
    int ans = 0;
    int n,b;
    cin >> n >> b;
    a[1] = 1;
    for(int i = 2;i <= n;i++){
        if(!a[i]){
            for(int j = i;j <= n;j += i){
                a[j] = i;
            }
               
        }
    }
    for(int i = 1;i <= n;i++){
        if(a[i] <= b){
            ans++;
        }
    }
    cout << ans;
    return 0;
}