import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long w = sc.nextInt();
		long d = sc.nextInt();
		while(d > 1) {
			w -= w / (d * d);
			d--;
		}
		System.out.println(w);
	}

}