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

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

            decimal rounds = Math.Ceiling( x / (w * m));
            Console.WriteLine(rounds);
        }
    }
}