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 Main {
    static int remainder = 0;

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int a = scanner.nextInt();
        int b = scanner.nextInt();
        int hours;
        hours = getHours(a, b);
        hours += remainder / b;

        System.out.println(hours);
    }

    private static int getHours(int a, int b) {
        int hours = 0;
        hours += a;
        remainder += a % b;
        if (a == 0)
            return 0;
        return hours + getHours(a / b, b);
    }
}