#include <bits/stdc++.h>

int main() {
    int w, d;
    std::cin >> w >> d;

    for (long i = d; i > 1; i--) {
        w = w - static_cast<int>((static_cast<double>(w) / i) / i);
    }

    std::cout << w << std::endl;

    return 0;
}