Bricks

import java.util.Scanner;

public class Bricks {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int x = Integer.parseInt(scanner.nextLine());
        int w = Integer.parseInt(scanner.nextLine());
        int m = Integer.parseInt(scanner.nextLine());

        int bricksInOneCourse = w * m;

        double totalCourses = Math.ceil( (double) x / bricksInOneCourse);
        System.out.print(totalCourses);




    }

}