题目描述
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-----
5
-----Sample Output-----
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.
输入格式
见题面
输出格式
见题面
样例输入
5
样例输出
3