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<iostream>
#include<cstdio>
#include<string>
#include<cstring>
#include<algorithm>
using namespace std;
typedef long long ll;
int n; 
inline void read(int &x)
{
	int f;char c;
	for (f=1,c=getchar();c<'0'||c>'9';c=getchar()) if(c=='-') f=-1;
	for (x=0;c<='9'&&c>='0';c=getchar()) x=x*10+(c&15);x*=f;
}
inline int mn(int _x,int _y)
{
	return _x<_y?_x:_y;
}
inline int mx(int _x,int _y)
{
	return _x>_y?_x:_y;
}
inline int ab(int _x)
{
	if(_x<0) return -_x;
	else return _x;
}
int main()
{
	read(n);
	printf("%d\n",(n-1)/2+1);
	return 0;
}