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