Elevator

import java.util.Scanner;

public class Elevator {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int numberOfPeople = Integer.parseInt(scanner.nextLine());
        int capacityOfElevator = Integer.parseInt(scanner.nextLine());

        // int fullCourses = (int)Math.ceil((double)numberOfPeople / capacityOfElevator);
        int courses = (int)Math.ceil((double)numberOfPeople / capacityOfElevator);
        int fullCourses = courses % numberOfPeople;

        System.out.println(fullCourses);
    }
}