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 Main{
    public static void main(String [] args){
        Scanner sc=new Scanner(System.in);
        int a=sc.nextInt(),b=sc.nextInt();
        int fc=a;
        int wc=0;
        int hour=0;
        while(fc>0||wc>b){
            if(fc>0){
            fc-=1;
            hour+=1;
            wc+=1;
            }
            else{
                if(wc>b){
                    fc+=1;
                    wc-=b;
                }
            }
        }
        System.out.println(hour);
    }
}