#include<iostream>
#include<string>
#include<string.h>
#include<algorithm>
#include<stdio.h>
#include<cmath>
#include<vector>
#include<utility>
#include<stack>
#include<queue>
#include<list>
#include<bitset>
#include<functional>

#define FOR(i, a, b) for(int i=(a);i<=(b);i++)
#define RFOR(i, a, b) for(int i=(a);i>=(b);i--)
#define MOD 1000000007
#define INF 1000000000

using namespace std;


int main(void) {
	double w, d;

	cin >> w >> d;

	RFOR(i, d, 2) {
		//cout << w << " " << (w / (i*i)) << endl;
		w -= (int)(w / (i*i));
		
	}
	cout << w << endl;
	return 0;
}