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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.io.*;
import java.util.Scanner;

public class Main {
  
  public static void main(String[] args){
    
    try {
      //ローカル変数定義
      int page;		//書類のページ
      int paper;	//用紙
      
      //標準入力受け取り
      Scanner scan = new Scanner(System.in);
      String  N    = scan.next();
      
      page = Integer.parseInt(N);
      
      //用紙算出
      if (page % 2 == 0) {
        paper = page/2;
      } else {
        paper = page/2 + 1;
      }
      
      System.out.println(paper);
      
    } catch (Exception e) {
      
      System.out.println("error");

    }
  }
}