import java.util.Scanner;

public class Main {

    public static void main(String[] args) {


        Scanner scanner = new Scanner(System.in);

        double bricks = Double.parseDouble(scanner.nextLine());
        double workers = Double.parseDouble(scanner.nextLine());
        double volume = Double.parseDouble(scanner.nextLine());

        double kurs  =  volume*workers ;
        double needKursove = bricks/kurs;

        System.out.printf( "%f", Math.ceil(needKursove)) ;
    }
}