import java.util.Scanner;
class N051{
	public static void main(String args[]){
		Scanner s = new Scanner(System.in);
		int w = s.nextInt();
		int d = s.nextInt();
		int a = d - 1;
		for(int i = 0; i < a; i++){
			w -= w / (d * d);
			d--;
		}
		System.out.println(w);
	}
}