#include <iostream>
#include <cstdint>

using namespace std;

int main() {
    int64_t w, d, count;
    cin >> w >> d;
    count = d - 1;
    for (int i = 0; i < count; ++i) {
        w -= (w / (d * d));
        d--;
    }
    cout << w << endl;
    return 0;
}