/*No.388 階段 (1)*/
import java.io.*;
public class No388 {
	public static void main(String[] args) {
		int floor;
		String stair,Hairetsu[]=new String[2];
		try(BufferedReader input = new BufferedReader(new InputStreamReader(System.in))){
			stair=input.readLine();
			Hairetsu=stair.split(" ");
			floor=Short.parseShort(Hairetsu[0])/Byte.parseByte(Hairetsu[1])+1;
			System.out.println(floor);
		}catch(Exception e){
			e.printStackTrace();
		}
	}
}