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 Candle {
	public static void main(String[] args){
		int a, b, sum = 0, ot = 0;
		Scanner input = new Scanner(System.in);
		a = input.nextInt();
		b = input.nextInt();
		sum += a;
		a/=b;
		ot = a%b;
		for(int i = 0; a > 0; i++){
				sum += a; a = (a+ot)/b; if((a+ot)>b) ot = (a+ot)%b; else ot = 0;
		}
		System.out.println(sum);
	}
}
