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 C++ (GCC 9.2.1) (judge verdict: Accepted)

#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)n;++i)
#define REP(i,a,b) for(int i=int(a);i<(int)b;++i)
#define Graph vector<vecctor<ll>>
#define pairs vector<pair<ll,ll>>
#define pb push_back



using namespace std;
using ll = long long;
const ll INF = 1e18;
const double PI = acos(-1);

template<class T> inline bool chmin(T& a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}
template<class T> inline bool chmax(T& a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}



int main(void)
{
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);
    
    int x;
    cin >> x;
    if(x >=30){
        cout << "Yes" << endl;
    }else{
        cout << "No" << endl;
    }



    return 0;
}