Problem:
Score : 100 points

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.

Sample Input 1

25

Sample Output 1

No

Sample Input 2

30

Sample Output 2

Yes

Solution in Ruby (2.7.1) (judge verdict: Accepted)

#あなたは、室温が 30度以上のとき、またそのときに限り、冷房の電源を入れます。
#今の室温は X度です。冷房の電源を入れますか？
tem=gets.to_i
if tem>=30
  puts "Yes"
else
  puts "No"
end