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.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


public class NewYearCandles {

	
	public static void main(String[] args) throws NumberFormatException, IOException {
		// TODO Auto-generated method stub
		BufferedReader inp = new BufferedReader (new InputStreamReader(System.in));

		String[] arr=(inp.readLine()).split(" ");
		int a=Integer.parseInt(arr[0]);
		int b=Integer.parseInt(arr[1]);
	
		int total=a;
		while(true)
		{
			if(a/b>0)
			{
				total=total+a/b;
				a=a/b;
			}
			else
				break;
		}
		
		System.out.println(total);
	}

}
