Program in C++ please:

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 X 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 1

25

Sample Output 1

No

Sample Input 2

30

Sample Output 2

Yes