import java.util.Scanner;

public class MVP {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		long N = s.nextLong();
		long K = s.nextLong();
		long i;
		s.close();
		for(i = 1;;i++){
			long D = (N/(K+1) + i);
			if(D*(K+1) > N){
				break;
			}
		}

		System.out.println(N/(K+1) + i);
	}

}