Problem Statement

You will turn on the air conditioner if, and only if, the temperature of the room is $30$ degrees Celsius or above.

The current temperature of the room is $X$ degrees Celsius. Will you turn on the air conditioner?

Constraints

• $-40 \leq X \leq 40$
• $X$ is an integer.

Input

Input is given from Standard Input in the following format:

X

Output

Print Yes if you will turn on the air conditioner; print No otherwise.