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.io.*;
public class candles {
	public static void main(String[] args) throws IOException {
		Scanner in = new Scanner(System.in);
		int start = in.nextInt();
		int inc = in.nextInt();
		int burnt = 0;
		int hours = start;
		int new1 = 0;
		int leftover = 0;
		while(start >= inc) {
			hours += start/inc;
			leftover = start%inc;
			start = ((start/inc)+leftover);
		}
		System.out.println(hours);
	}
}