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>

typedef long long ll;
#define repd(i,a,b) for (ll i=(a);i<(b);i++)
#define rep(i,n) repd(i,0,n)

ll mod=1e9+7;

using namespace std;


ll inputValue(){
	ll a;
	cin >> a;
	return a;
};

void inputArray(int * p, ll a){
	rep(i, a){
		cin >> p[i];
	}
};

template<typename T>
void inputVector(vector<T>& p, ll a){
	rep(i, a){
		T input;
		cin >> input;
		p.emplace_back(input);
	}
}


template <typename T>
void output(T a) {
	cout << a << "\n";
}

int main(int argc, const char * argv[]) {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
    ll i;
    cin >> i;
    cout << (i/2+i%2) << endl;
	return 0;
}