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 (GCC 5.4.1) (judge verdict: Accepted)

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include <math.h>

//#define rep(i,n) for(int i = 0;i<(n);i++);



int ASCttenannoryaku(const void *a,const void *b) {
	return *(int *)a - *(int *)b;
}
int main(void)
{
	int n;
	scanf("%d",&n);
	int ans = n / 2;
	if (n % 2 == 1)ans += 1;
	printf("%d",ans);

	return 0;
}