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>
#include <algorithm>
#define rep(i, n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;
template<class T> inline bool chmax(T& a, T b){if(a < b){ a = b; return 1;} return 0;}
template<class T> inline bool chmin(T& a, T b){if(a > b){ a = b; return 1;} return 0;}

const ll MOD = 1000000000+7;

int main(){
    int n;
    cin >> n;

    cout << (n+1) / 2 << endl;
    return 0;
}