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: Runtime Error)

package com.company;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		double num = sc.nextDouble();
		double ans;
		ans=Math.ceil(num/2);
		int a;
		a=(int)ans;
		System.out.println(a);

		/*Scanner sc = new Scanner(System.in);
		long num = sc.nextLong();
		if(num%2==1){
			System.out.println(0);
		}
		else {

			long sum=0;
			for (long i = 5; i<=2*num; i=5*i) {
				sum += (long)(num/(2*i));
			}
			System.out.println(sum);

		 */
		}
	}