import java.util.Scanner;
public class No51 {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		double W = s.nextDouble() , D = s.nextDouble();
		s.close();
		for(int i = 0;i < D -1;i++){
			double d2 = D - i;
			int w2 = (int)Math.floor(W/d2/d2);
			W -= w2;
		}
		System.out.println((int)W);

	}

}