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 NewYearCandles {

   
    public static void main(String[] args) {
        Scanner input=new Scanner(System.in);
        
        int a,b;
        
        a=input.nextInt();
        b=input.nextInt();
        
        int count=0;
        int count2=0;
        int sum=a;
        int div=0;
        int rem=0;
        
        if(a%b==0)
        {
            count=a/b;
            System.out.println(a+count+(count/b));
        }
        else 
        {
            while(a >= b)
            {
        div = a / b;
        sum += div;
        rem = a % b;
        a = div + rem;
            }
             System.out.println(sum);
        }
        
       
        
    }
    
}
