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.*;
import java.io.*;
public class NewYearCandles
{
   public static void main(String[] args) throws Exception
   {       
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
      StringTokenizer st = new StringTokenizer(br.readLine());
      int a = Integer.parseInt(st.nextToken());
      int b = Integer.parseInt(st.nextToken());
      int count = a;
      while (a >= b)
      {
         a /= b;
         count += a;
      }
      
      System.out.println(count);
      br.close();
   }
}