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

namespace HelloCSharp
{
    class Program
    {
        static void Main(string[] args)
        {
            int bricks = int.Parse(Console.ReadLine());
            int workers = int.Parse(Console.ReadLine());
            int cartVolume = int.Parse(Console.ReadLine());
            double totalBricksPerCourse = workers * cartVolume;
            double totalBricksFromAllCourses = bricks / totalBricksPerCourse;
            Console.WriteLine(Math.Ceiling(totalBricksFromAllCourses));
        }
    }
}