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.

-----Sample Input-----
25

-----Sample Output-----
No