import java.util.*;
public class Work{
	public static void main(String[] arg){
		Scanner sc = new Scanner(System.in);
		long w,d,temp;
		w = sc.nextInt();
		d = sc.nextInt();
		for(int i = 0;i<d-1;i++){
			temp = w/((d-i)*(d-i));
			w = w - temp;
		}
		System.out.println(w);
	}
}