#include "bits/stdc++.h"
using namespace std;

typedef long long Int;
#define REP(i,n) for(int (i)=0;(i)<(int)(n);++(i))

int main() {
	Int W, D; cin >> W >> D;
	for (; D > 1; D--) {
		W -= W / (D * D);
	}
	cout << W << endl;
}