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>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;

#define Max 			1e6
#define ff              first
#define ss              second
#define ll              long long
#define pb              push_back
#define ppb				pop_back
#define pf				push_front
#define ppf				pop_front
#define mp              make_pair
#define pii             pair<ll,ll>
#define vi              vector<ll>
#define v 				vector
#define mii             map<ll,ll>
#define umap			unordered_map
#define pq              priority_queue<ll>
#define pqm             priority_queue<ll,vi,greater<ll> >
#define setbits(x)      __builtin_popcountll(x)
#define zrobits(x)      __builtin_ctzll(x)
#define mod             1000000007
#define inf             1e18
#define ps(x,y)         fixed<<setprecision(y)<<x
#define mk(arr,n,type)  type *arr=new type[n];
#define w(x)            ll x; cin>>x; while(x--)
#define all(x)			x.begin(),x.end()
#define sp 				' '
#define pi 				3.14159265359
#define intmax 			INT32_MAX
#define intmin			INT32_MIN
#define conti           continue
mt19937                 rng(chrono::steady_clock::now().time_since_epoch().count());
ll d8[8][2] = {{ -1, -1}, { -1, 0}, { -1, 1}, {0, -1}, {0, 1}, {1, -1}, {1, 0}, {1, 1}};
ll d4[4][2] = {{ -1, 0}, {0, -1}, {0, 1}, {1, 0}};
typedef tree<ll, null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update> pbds;
/* ordered set:
tree<T, null_type,less<T>, rb_tree_tag,tree_order_statistics_node_update>
member functions :
1. order_of_key(k) : number of elements strictly lesser than k
2. find_by_order(k) : k-th element in the set
*/
void IO()
{
#ifndef ONLINE_JUDGE
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
	freopen("error.txt", "w", stderr);
#endif
}
void fastIO()
{
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
}




int main()
{
	fastIO();
	IO();
	ll n;
	cin>>n;
	if(n>=30)
	{
		cout<<"Yes"<<endl;
	}
	else 
	{
		cout<<"No"<<endl;
	}
	return 0;
}