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.util.Scanner;

public class A {
	
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int a = in.nextInt();
		int b = in.nextInt();
		
		if (b > a) {System.out.println(a);return;}
		
		int currentNumCandles = a;
		int candleTotal = a;
		while (currentNumCandles >= b) {
			candleTotal += currentNumCandles/b;
			currentNumCandles = (currentNumCandles/b) + currentNumCandles%b;

		}
		System.out.println(candleTotal);
		
	}
	
}
