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: Wrong Answer)

using System;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            double a, b, c;
            a = double.Parse(Console.ReadLine()); //標準入力
                                               //string[] str = Console.ReadLine().Split(' ');//2つ以上のスペース区切り入力の取得
                                               //b = int.Parse(str[0]);  //数値で受け取りたい場合は変換する
                                               //c = int.Parse(str[1]);
                                               //Console.Write("改行なし a = {0} b = {1} c = {2}", a, b, c)//改行なし出力
                                               //Console.WriteLine("改行あり a = {0} b = {1} c = {2}", a, b, c);//改行付き出力
            Console.WriteLine(Math.Round(a));
        }
    }
}