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.*;
public class Velas {
	public static void main(String[] args) {
	Scanner sc = new Scanner(System.in);
	int a = sc.nextInt();
	int b = sc.nextInt();
	int c,suma;
	suma = 0;
	
		c = a/b;
		suma = suma + c;
		c = c + a%b;

		if(c==b) {
				c = c/b;
				suma = suma + c ;
				c = c + c%b;

		}else{
		while(c>b){
				c = c/b;
				suma = suma + c + 1 ;
				c = c + c%b;
			}	
		}
		System.out.println(a+suma);
	}
}
