using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication4
{
	class Program
	{
		static void Main(string[] args)
		{
			float penWidth = 3;

			Console.WriteLine(Math.Round((double)penWidth / 2));

			penWidth = 5;

			Console.WriteLine(Math.Round((double)penWidth / 2));

			penWidth = 7;

			Console.WriteLine(Math.Round((double)penWidth / 2));

			penWidth = 9;

			Console.WriteLine(Math.Round((double)penWidth / 2));

			Console.ReadLine();
		}
	}
}