#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <math.h>
using namespace std;

int main() {
    int w,d;
    cin >> w >> d;
    for(int i = d;i > 1;i--){
        w -= w/i/i;
    }
    cout << w << endl;
    return 0;
}