import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int w = sc.nextInt();
		int d = sc.nextInt();
		int ans = 0;
		while (w > 0) {
		    ans = w;
		    w -= w / d / d;
		    d--;
		}
		System.out.println(ans);
	}
}