import java.util.Scanner;

public class No51 {
	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);
	}
}