第三个 WA 了，实在是搞不懂 90分

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		int n = input.nextInt();
		int k = input.nextInt();
		int nNew = (int) (n / k);
		int more = n % k;

		int num = n + nNew;

		if (nNew >= k) {
			int nNewmore = (int) (nNew / k);
			num += nNewmore;
			more += nNewmore + nNew % k;
		}
		if (more >= k) {
			int moreMore = (int) (more / k);
			num += moreMore;
			more += moreMore + moreMore % k;
		}
		if (more < k) {
			System.out.println(num);
		}

	}
}