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/hash_map>
#include <ext/numeric>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/detail/standard_policies.hpp>

using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;

#define REP(i,n) for( (i)=0 ; (i)<(n) ; (i)++ )
#define rep(i,x,n) for( (i)=(x) ; (i)<(n) ; (i)++ )
#define REV(i,n) for( (i)=(n) ; (i)>=0 ; (i)-- )
#define FORIT(it,x) for( (it)=(x).begin() ; (it)!=(x).end() ; (it)++ )
#define foreach(it,c) for(__typeof((c).begin()) it=(c).begin();it!=(c).end();++it)
#define rforeach(it,c) for(__typeof((c).rbegin()) it=(c).rbegin();it!=(c).rend();++it)
#define foreach2d(i, j, v) foreach(i,v) foreach(j,*i)
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define SZ(x) ((int)(x).size())
#define MMS(x,n) memset(x,n,sizeof(x))
#define mms(x,n,s) memset(x,n,sizeof(x)*s)
#define pb push_back
#define mp make_pair
#define NX next_permutation
#define UN(x) sort(all(x)),x.erase(unique(all(x)),x.end())
#define CV(x,n) count(all(x),(n))
#define FIND(x,n) find(all(x),(n))-(x).begin()
#define ACC(x) accumulate(all(x),0)
#define PPC(x) __builtin_popcountll(x)
#define LZ(x) __builtin_clz(x)
#define TZ(x) __builtin_ctz(x)
#define mxe(x) *max_element(all(x))
#define mne(x) *min_element(all(x))
#define low(x,i) lower_bound(all(x),i)
#define upp(x,i) upper_bound(all(x),i)
#define NXPOW2(x) (1ll << ((int)log2(x)+1))
#define PR(x) cout << #x << " = " << (x) << endl ;

typedef unsigned long long ull;
typedef long long ll;
typedef vector<int> vi;
typedef vector<vector<int> > vvi;
typedef pair<int, int> pii;
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

const int OO = (int) 2e9;
const double eps = 1e-9;

int main() {
	std::ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
#ifndef ONLINE_JUDGE
//	freopen("in.txt", "rt", stdin);
//	freopen("out.txt", "wt", stdout);
#endif
	int x;
	cin >> x;
	if (x >= 30)
		puts("Yes");
	else
		puts("No");
	return 0;
}