import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Candles {
	public static void main(String[]args) throws IOException {
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st=new StringTokenizer(br.readLine());
		int a=Integer.parseInt(st.nextToken());
		int b=Integer.parseInt(st.nextToken());
		int cnt=a;
		while(a>=b)
		{
			a=a-b+1;
			++cnt;
		}
		System.out.println(cnt);
	}
}
