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 Candles 
{

    public static void main(String[] args) 
    {
        Scanner Scanner = new Scanner(System.in);
        int a = Scanner.nextInt();
        int b = Scanner.nextInt();
        int x=0;
        int sum=0;
        int mod =a%b;
        sum = sum + a;
        x = a/b;
        
        if (a < b)
            System.out.println(sum);
        if(a % b == 0)
        {
            sum = sum + x;
            while (x >= b)
            {
                x=x/b;
                sum=sum+x;
                
            }
            System.out.println(sum);
        }
        else
            {
                mod = mod + (x%b);
                x = a/b;
                sum = sum + x;
                while (x >= b)
                {
                    mod = mod + (x%b);
                    x=x/b;
                    sum=sum+x;
                }
                System.out.println(sum+(mod/b));
            }
    
    }
    
}