package 刷题.入门;
import java.util.Scanner;
public class Peter的烟 {
public static void main(String[] args) {
Scanner scanner=new Scanner(System.in);
int n = scanner.nextInt();
int k = scanner.nextInt();
int res=get(n, k);
System.out.println(res+n);
}
//返回n根烟 能兑换的根数
static int get(int n,int k) {
if (n<k) {
return 0;
}else {
//能兑换n/k
return n/k+get(n%k+n/k, k);
}
}
}