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;

namespace testapp
{
    //A君は全てのページ数が合わせてNの書類を紙の両面に印刷する
    //N%2==1ならばN/2+1
    //N%2==0ならばN/2
    class Program
    {
        static void Main(string[] args)
        {
            var input = int.Parse(Console.ReadLine());
            if(input%2==1) Console.WriteLine(input / 2 + 1);
            if (input % 2 == 0) Console.WriteLine(input / 2);
        }
    }
}