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: Wrong Answer)

#include <bits/stdc++.h>
using namespace std;
#define endl "\n"
#define ll long long
#define fastIO ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define gcd(a,b) __gcd((a),(b))
#define lcm(a,b) ((a)*(b))/gcd((a),(b))
#define rep(i,n) for (int i = 0; i < n; i++)
#define FOR(i,a,b) for (int i = a; i < b; i++)
#define ffor(i,a,b) for(int i = a ; i <= b; i++)
#define REPD(i,n) for (int i = n-1; i >= 0; i--)
#define FORD(i,a,b) for (int i = a; i >= b; i--)
const int N = 1e6;
typedef pair <int, int> pi;
typedef std::vector<int> vi;
typedef std::vector<long long> VI;

/*bool isprime(int a) {
	if (a < 2) return false;
	for (int i = 2; i * i <= a; i++) {
		if (a % i == 0)
			return false;  // 0(n) or 0(n^2) Tell me in the comment section
	}
	retunn true;
}*/



int main() {
#ifndef ONLINE_JUDGE
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
#endif
	fastIO
	int x;
	cin >> x;
	if (x >= 30) {
		cout << "YES" << endl;
	} else {
		cout << "NO" << endl;
	}
	return 0;
}