Problem Statement

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