5 3
 1000 3
 777 17
 4 3
 2 2
 100 4
 10 4
 999 2
 6 4
 1 2
 17 3
 1 4
 26 8
 91 5
 1 3
 1000 2
 20 3
 9 4
 123 5
 1000 1000
 3 2
 3 3
 80 970
 1000 4
 1 1000

7
 1499
 825
 5
 3
 133
 13
 1997
 7
 1
 25
 1
 29
 113
 1
 1999
 29
 11
 153
 1001
 5
 4
 80
 1333
 1

import java.io.BufferedReader;
import java.io.InputStreamReader;


public class NewYearCandles {

	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String line = br.readLine();
		String[] parts = line.split(" ");
		
		int a, b;
		a = ti(parts[0]);
		b = ti(parts[1]);
		
		System.out.println(solve(a, b));
	}

	private static int solve(int a, int b) {
		int res = a;
		while (a >= b) {
			res += a/b;
			a = a/b + a%b;
		}
		return res;
	}

	private static int ti(String s) {
		return Integer.parseInt(s);
	}
}
