import java.util.Scanner;

public class Yukicoder51 {

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