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 New_Year_Candles_379A {
    public static void main(String[] args) {
        Scanner In=new Scanner(System.in);
        float a,b,d,sum=0;
        
        a=In.nextFloat();
        b=In.nextFloat();
        sum=a;
        while(a>=b){
           
           d=(a/b);           
           sum=sum+d;
           a=d;
        }
        sum=(int)sum;
        System.out.println(Math.ceil(sum));
    }
  
}
