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 Rust (1.15.1) (judge verdict: Accepted)

fn main() {
    let input = read().parse::<u32>().unwrap();
    let add = if input % 2 == 1 { 1 } else { 0 };
    println!("{}", input / 2 + add);
}
fn read() -> String {
    use std::io::Read;
    let mut line = String::new();
    std::io::stdin().read_to_string(&mut line).unwrap();
    line.trim().to_string()
}