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.

Examples

Input

25


Output

No


Input

30


Output

Yes
class Main{

	public static void main (String[] args) {

		Main main = new Main();

		java.util.Scanner sc = new java.util.Scanner(System.in);

		int temp = sc.nextInt();

		if (temp>=30) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}

		sc.close();;

	}

}
