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 PHP7 (7.0.15) (judge verdict: Wrong Answer)

<?php
fscanf(STDIN, '%d %d', $a, $b);
fscanf(STDIN, '%s', $s);
echo "$a\n$b\n$s";
if ( preg_match("/\A\d{{$a}}[-]\d{{$b}}\z/", $s) ) {
  echo "Yes\n";
} else {
  echo "No\n";
}