import java.util.Scanner;


public class Main_yukicoder51 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        long w = sc.nextLong();
        long d = sc.nextLong();
        for (; d >= 2; d--) {
        	w -= w / (d * d);
        }

        System.out.println(w);
        
        sc.close();
    }
}