import java.util.Scanner;

public class No477 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner s = new Scanner(System.in);
		
		long n = s.nextLong();
		long k = s.nextLong();
		
		long m = n % (k + 1);
		long ans = (n - m) / (k + 1) + 1;
		
		System.out.println(ans);
	}

}