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

namespace yukicoderTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = Console.ReadLine();
            int c = int.Parse(str);
            double ans = (double)c / 2;
            if(ans%1!=0)
            {
                ans = (int)ans + 1;
            }
            Console.WriteLine(ans);
        }
    }
}