Problem:
Score : 100 points

Problem Statement

How many hours do we have until New Year at M o'clock (24-hour notation) on 30th, December?

Constraints

1≤M≤23

M is an integer.

Input

Input is given from Standard Input in the following format:

M

Output

If we have x hours until New Year at M o'clock on 30th, December, print x.

Sample Input 1

21

Sample Output 1

27

We have 27 hours until New Year at 21 o'clock on 30th, December.

Sample Input 2

12

Sample Output 2

36

Solution in Rust (1.15.1) (judge verdict: Accepted)

use std::io;
fn main() {
    let stdin = io::stdin();
    let mut buf = String::new();
    stdin
        .read_line(&mut buf)
        .unwrap();
    let n: usize = buf.trim().parse().unwrap();
    println!("{}", 24 + (24 - n));
}