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?

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.

Constraints

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

Sample Input 1

25

Sample Output 1

No

Sample Input 2

30

Sample Output 2

Yes

见题面 Input 部分

见题面 Output 部分