import java.util.Scanner;

public class Main51 {
	public static void main(String[] args) {
		Main51 p = new Main51();
	}

	public Main51() {
		Scanner sc = new Scanner(System.in);
		long w = sc.nextLong();
		long d = sc.nextLong();
		solve(w, d);
	}

	public void solve(long w, long d) {
		for(long i=d;i>1;i--){
			w -= w/i/i;
		}
		
		System.out.println(w);
	}

}