#include <iostream>		//cin, cout
#include <vector>		//vector
#include <algorithm>	//sort,min,max,count
#include <string>		//string,getline, to_string
#include <cstdlib>		//abs(int)
#include <utility>		//swap, pair
#include <deque>		//deque
#include <climits>		//INT_MAX
#include <bitset>		//bitset
#include <cmath>		//sqrt, ceil. M_PI, pow, sin

using namespace std;

int main() {

	long long int W, D;
	cin >> W >> D;

	if (W < D* D) {
		D = static_cast<int>(sqrt(W));
	}

	for (long long int i = D; i > 1; i--) {
		long long int a = W / (i * i);
		W = W - a;
	}

	cout << W << endl;

	return 0;

}