#include <iostream>
using namespace std;
int main() {
	unsigned long W, D;
	cin >> W >> D;
	for (int i = 0; i < D;i++) {
		if (D - i == 1) { cout << W << endl; return 0; }
		W -= (W / (D - i))/(D - i);
	}
	return 0;
}