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++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <bits/stdc++.h>
using namespace std;
#define SORT(a) sort((a).begin(), (a).end())
#define RSORT(a) reverse((a).begin() z, (a).end())
#define rep(i, n) for (int i = 0; i < n; i++)
typedef long long ll;
const long long MOD = 1000000007;
const long long INF = 1LL << 60;
// const int INF = 1001001001;

int main() {
  int n;
  cin >> n;
  if (n % 2 == 1)
    cout << n / 2 + 1 << endl;
  else
    cout << n / 2 << endl;
}