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 C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;

namespace ABC084
{
    class A
    {
        static void Main(string[] args)
        {
            int M = int.Parse(Console.ReadLine());

            int res = (24 - M) + 24;

            Console.WriteLine(res);
        }
    }
}