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.io.*;
import java.util.*;
public class NewYearCandles{

     public static void main(String[] args) throws IOException{

    BufferedReader bufferRead = new BufferedReader(new  InputStreamReader(System.in));
      StringTokenizer st = new StringTokenizer(bufferRead.readLine(), " "); 
int a = Integer.parseInt(st.nextToken());
 int b = Integer.parseInt(st.nextToken());
//int a = 6;
//int b = 3;
int nh = a;
int diff = 1;
int rem = a % b;
int flg = 0;
if (a >= b){
     diff = a/b + rem;
    while (diff >= b){
         
         
         flg = 1;
        
        nh = nh + a/b;
        a = a/b + rem;
        diff = a;
        rem=a%b;
        
    }
}
if (flg == 0)
System.out.println(nh + diff);
else
System.out.println(nh);         
}
}