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.*;
import java.util.*;

/*
 * To execute Java, please define "static void main" on a class
 * named Solution.
 *
 * If you need more classes, simply define them inline.
 */

public class NewYearCandle {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    
    int candleCount = sc.nextInt();
    int requiredToRecycle = sc.nextInt();
    
    int hours = 0;
    while(candleCount > 0){
      hours+=candleCount;
      candleCount /= requiredToRecycle;
    }
    System.out.println(hours);
  }
}
