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

/*package whatever //do not write package name here */

import java.io.*;
import java.util.*;
public class  GFG {
	public static void main (String[] args) {
	Scanner sc=new Scanner(System.in);
	int a=sc.nextInt();
	int b=sc.nextInt();
	
	int s=a;
	int k=0;
	while(a>=b)
	{
	   s=s+1;
	   k=k+1;
	   a=a-b;
	}
	s=s+((a+k)/b);
	System.out.println(s);
	}
}