#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <iostream>
#include <map>
#include <list>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <queue>
#include <iomanip>
#define INF 1050000000
#define SIZE 100001
#define MOD 1000000007

using namespace std;

int main(void)
{
	int w, d;

	cin >> w >> d;

	for (int i = d; i >= 1; i--) {
		if (i == 1) {
			w = (w / i / i);
		} else {
			w = w - (w / i / i); 
		}
	}

	cout << w << endl;

	return (0);
}
/*for (int i = 0; i < n; i++) {

	}*/