Problem Statement

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

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.

Constraints

• 1≤M≤23
• M is an integer.

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

见题面 Input 部分

见题面 Output 部分