import java.io.*;
import java.util.*;

class Main51 {
	
	public static void out (Object out) {
		System.out.println(out);
	}
	
	public static void main (String[] args) throws IOException {
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		
		int w = Integer.parseInt(br.readLine());
		int d = Integer.parseInt(br.readLine());
		int ans = 0;
		
		for (int i = 0; i < d; i++)
			w -= (ans = w / ((d - i) * (d - i)));
		
		out(ans);
	}
}