bricks

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Globalization;

class Program
{
    static void Main(string[] args)
    {
        var bricks = double.Parse(Console.ReadLine());
        var workers = double.Parse(Console.ReadLine());
        var bricksPerWOrker = double.Parse(Console.ReadLine());

        var bricksPerCourse = workers * bricksPerWOrker;

        var coursesCount = Math.Ceiling(bricks / bricksPerCourse);
        Console.WriteLine(coursesCount);

    }
}