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)

/**
 * code generated by JHelper
 * More info: https://github.com/AlexeyDmitriev/JHelper
 * @author Joy
 */

#include <bits/stdc++.h>
#define REP(i, N) for (ll i = 0; i < (N); ++i)
#define ALL(x) (x).begin(), (x).end()
#define MOD 1000000007
#define INF ll(1e9)
#define INFL ll(1e18)
#define PB push_back
#define MP make_pair
using namespace std;
typedef long long ll;
ll gcd(ll x, ll y) { return y ? gcd(y, x % y) : x; }
int ctoi(char c) {return c - '0';}

class ADuplexPrinting {
public:
	void solve(std::istream& in, std::ostream& out) {
	    int N;
	    in >> N;
	    int ans;
	    if (N & 1) ans = N / 2 + 1;
	    else ans = N/2;
	    out << ans << '\n';
	}
};


int main() {
	ADuplexPrinting solver;
	std::istream& in(std::cin);
	std::ostream& out(std::cout);
	solver.solve(in, out);
	return 0;
}