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());
            long totalBricksPerCourse = workers*cartVolume;
            long totalBricksFromAllCourses=0;
            int courses = 0;

            while (totalBricksFromAllCourses<bricks)
            {
                courses++;
                totalBricksFromAllCourses += totalBricksPerCourse;
            }
            Console.WriteLine(courses);

        }
    }
}