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.text.DecimalFormat;
import java.util.Scanner;

/**
 *
 * @author Marwan
 */
public class Candles {
    public static void main(String[] args)  {
     Scanner in = new Scanner(System.in);
     double a=in.nextInt();
     double b=in.nextInt();
     double hours=a;
     while(a>=b) {
         
       a=(a/b);
       
       hours+=a;
     }
     DecimalFormat df = new DecimalFormat("#");
     System.out.println(df.format(hours));
     
    }
}
