02.Bricks

using System;

namespace _02.Bricks
{
    class Bricks
    {
        static void Main(string[] args)
        {
            int x = int.Parse(Console.ReadLine());
            int w = int.Parse(Console.ReadLine());
            int m = int.Parse(Console.ReadLine());

            int bricksInOneCourse = w * m;

            double totalCourses = Math.Ceiling((double)x / bricksInOneCourse);

            Console.WriteLine(totalCourses);
        }
    }
}