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;
import java.util.Arrays;
public class Watermelon {

	
	public static void main(String[] args){
	   Scanner scan=new Scanner(System.in);
int a=scan.nextInt();
int b=scan.nextInt();int i=a;int count=0;
if(a<b){
	System.out.println(a);System.exit(0);
}
  
if(a%b==0){
while(i>=b){
	
	count=count+i/b;
	i=i/b;
	
}
	
	
	System.out.println(a+count);
}
else{
	while(i>=b){
		
		count=count+i/b;
		i=i/b+a%b;

	}
System.out.println(a+count);
}
	
	
	
	
	
	}}	


