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.lang.*;
import java.util.Scanner;
public class solution{
    public static void main(String args[]){
        Scanner sc =new Scanner(System.in);
        int a=sc.nextInt();
        int b=sc.nextInt();
        System.out.print(a+candlecount(a/b,b));
        
    }
    public static int candlecount(int n1,int n2){
        if(n1<n2)
        return 0;
        else if(n1 == n2 ){
            return 1;
        }
        else
        return n1+candlecount(n1/n2+n1%n2,n2);
    }
}