#include <bits/stdc++.h>

using namespace std;

int main() {
    int a[2000000] = {0},n,x,f;
    long long ans = 0;
    cin >> n >> x;
    for(int i = 2; i <= n; i += 2){
        a[i - 2] = 1;
    }
    for(int i = 2; i <= n; i++){
        if (a[i - 2] > 0) {
            if (a[i - 2] >= x) ans++;
            continue;
        }
        f = 0;
        for(int j = 3; j * j <= i; j += 2){
            if (i % j == 0) {
                f = 1;
                break;
            }
        }
        if (f == 0) {
            for(int k = i; k <= n; k += i) {
                a[k - 2]++;
            }
        }
    }
    cout << ans << "\n";
    return 0;
}