#include<iostream>
using namespace std ;
int main(){
int a;
cin>>a;
if(a>=30){cout<<"Yes";}
else cout <<"No";
return 0;
}

### Prompt

In CPP, your task is to solve the following problem:

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

### Response

```cpp
#include<iostream>
using namespace std ;
int main(){
int a;
cin>>a;
if(a>=30){cout<<"Yes";}
else cout <<"No";
return 0;
}

```