#include <bits/stdc++.h>
#define PI 3.14159265359
#define NIL -1
using namespace std;
const int64_t MOD = 1e9 + 7;

int main() {
	int64_t W, D;
	cin >> W >> D;

	int ans = -1;
	while (W) {
		int64_t n = W / (D * D);
		ans = n;
		W -= n;
		D--;
	}

	cout << ans << endl;
}