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.CodeDom.Compiler;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Xml;

class Program
{
	static void Main(string[] args)
	{
		int N = int.Parse(Console.ReadLine());
		Console.WriteLine((N + 1) / 2);
	}
}

//string s = Console.ReadLine();
//int[] inputintArray = Console.ReadLine().Split(' ').Select(i => int.Parse(i)).ToArray();
//int H = inputintArray[0];
//int W = inputintArray[1];
//int N = int.Parse(Console.ReadLine());
//int[] a = Console.ReadLine().Split(' ').Select(i => int.Parse(i)).ToArray();

//Console.WriteLine(ans);
//Console.ReadKey();