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;
        
        for (int i = 1; i <=1000; i++) {
            if(sum-b<=0)
            {
                if(sum-b==0)
                {
                    count=i;
                    break;
                }
                else if(sum-b<0)
                {
                    count=i-1;
                    break;
                }
                
            }
                
            sum=sum-b;
        }
        int sum2=count;
         for (int i = 1; i <=1000; i++) {
            if(sum2-b<=0)
            {
                if(sum2-b==0)
                {
                    count=i;
                    break;
                }
                else if(sum2-b<0)
                {
                    count=i-1;
                    break;
                }
                
            }
                
            sum2=sum2-b;
        }
        
        System.out.println(count+sum2+a);
        
        
    }
    
}
