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;
public class cvb{
public static void main(String[] args){
Scanner in = new Scanner(System.in);
int a=in.nextInt();
int b=in.nextInt();
int f1=a,f2=0,r=0;
for(int i=1;i>0;i++){
f1=f1+(a/b);
f2=f2+(a%b);
a=a/b;
if(a==0){break;} }
for(int i=1;i>0;i++){
f1=f1+(f2/b);
r=r+(f2%b);
f2=f2/b;
if(f2==0){break;} }
System.out.print(f1+(r/b));
}}