Problem:
Score : 100 points

Problem Statement

Takahashi wants to print a document with N pages double-sided, where two pages of data can be printed on one sheet of paper.

At least how many sheets of paper does he need?

Constraints

N is an integer.

1 \leq N \leq 100

Input

Input is given from Standard Input in the following format:

N

Output

Print the answer.

Sample Input 1

5

Sample Output 1

3

By printing the 1-st, 2-nd pages on the 1-st sheet, 3-rd and 4-th pages on the 2-nd sheet, and 5-th page on the 3-rd sheet, we can print all the data on 3 sheets of paper.

Sample Input 2

2

Sample Output 2

1

Sample Input 3

100

Sample Output 3

50

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Linq;

namespace AtCoderBeginnerContest157
{
	class Program
	{
		static void Main(string[] args)
		{
			var page = ReadInt();
			var kisu = page % 2 == 1;
			Console.WriteLine(kisu ? page / 2 + 1 : page / 2);
		}

		public static int ReadInt()
			=> int.Parse(Console.ReadLine());

		public static int[] ReadIntArray()
			=> Console.ReadLine().Split().Select(x => int.Parse(x)).ToArray();

		public static long ReadLong()
			=> long.Parse(Console.ReadLine());

		public static long[] ReadLongArray()
			=> Console.ReadLine().Split().Select(x => long.Parse(x)).ToArray();

		public static string ReadString()
			=> Console.ReadLine();

		public static string[] ReadStringArray()
			=> Console.ReadLine().Split();
	}
}