using System;

namespace yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            int a = int.Parse(Console.ReadLine());
            int sum = 0;
            sum = a / 2;
            if (a % 2 != 0)
            {
                sum += a % 2;
            }

            Console.WriteLine(sum);
        }
    }
}