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>
    using namespace std;
    #define ll long long 
    #define ld long double
    #define MOD 1000000007
    #define mod9 1000000009
    #define fast ios_base :: sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL);
    #define mp make_pair
    #define pb push_back
    #define ct ll t;cin>>t;while(t--)
    #define bi begin()
    #define ei end()
    #define fi first 
    #define se second  
    #define foe(i,a,b) for(ll i=a;i<b;i++)
    #define rfoe(i,a,b) for(ll i=a;i>=0;i--)
    #define sz(s) s.size() 
    #define mem(a,s) memset(a,s,sizeof(a)) 
    #define all(v) v.bi,v.ei
    #define MAX             8000000000000000064LL
    #define MIN            -8000000000000000064LL  
    // ll MOD; 
    ll add(ll a, ll b){return (a%MOD + b%MOD + ((MAX)/MOD)*MOD)%MOD;}
    ll sub(ll a, ll b){return (a%MOD - b%MOD + ((MAX)/MOD)*MOD)%MOD;}
    ll mul(ll a, ll b){return ((a%MOD)*(b%MOD) + ((MAX)/MOD)*MOD)%MOD;}
    bool isPrime(ll n) 
    { 
        // Corner case 
        if (n <= 1) 
            return false; 
        
        // Check from 2 to n-1 
        for (ll i = 2; i*i <= n; i++) 
            if (n % i == 0) 
                return false; 
        
        return true; 
    }
    long long binpow(long long a, long long b) {
        long long res = 1;
        while (b > 0) {
            if (b & 1)
                res = mul(res,a);
            a = mul(a,a);
            b >>= 1;
        }
        return res%MOD;
    }

    bool compare(const pair<ll,ll>&a,const pair<ll,ll>&b)
    {
        return (a.se>b.se);
    }
    ll lcm(ll a,ll b)
    {
        return(a*b)/__gcd(a,b);
    }
    //vector<ll>s;
    //// set<ll>s1;
    //bool prime[100009]={false};
    //    // set<ll>s1;
    //    void Sieve() 
    //    {  
    //        ll n=100009;
    //        prime[0]=prime[1]=true;
    //        // s[0]=0;
    //        // s[1]=1;
    //        // s.pb(1);
    //        // t.insert(1);
    //        for (int p=2; p*p<=n; p++) 
    //        { 
    //        
    //        if(prime[p]==false)
    //        {
    //            //    s.pb(p);
    //            for(ll j=p*p;j<=n;j+=p)
    //            {
    //                prime[j]=true;
    //            }    
    //        }
    //        } 
    //        for(ll i=2;i<n;i++)
    //        {
    //            if(!prime[i])
    //            {
    //                s.pb(i);
    //                // s1.insert(i);
    //            }
    //        }
    //} 
    //     ll eea(ll a, ll b, ll & x, ll & y) {
    //     if (a == 0) {
    //         x = 0;
    //         y = 1;
    //         return b;
    //     }
    //     ll x1, y1;
    //     ll d=eea(b % a, a, x1, y1);
    //     x = y1 - (b / a) * x1;
    //     y = x1;
    //     return d;
    // }
    // bool find_any_solution(ll a, ll b, ll c, ll &x0, ll &y0, ll &g) {
    //     g = eea(abs(a), abs(b), x0, y0);
    //     if (c % g) {
    //         return false;
    //     }

    //     x0 *= c / g;
    //     y0 *= c / g;
    //     if (a < 0) x0 = -x0;
    //     if (b < 0) y0 = -y0;
    //     return true;
    // }
    // ll modinverse(ll a,ll m)
    // {
    //     ll x, y;
    //     eea(a, m, x, y);
    //     if (__gcd(a,m) != 1) {
    //     return -1;
    //     }
    // else {
    //     x = (x % m + m) % m;
    //     cout << x << endl;
    //     return x;
    // }
    // }

    ll fact[1000007]={0};
    ll expo(ll x, ll y) {ll res=1;x=x%MOD;while(y>0){if(y&1)res=(1ll*res*x)%MOD;
    y=y>>1;x=(1ll*x*x)%MOD;} return res;}
    void facto() {fact[0]=1;fact[1]=1;for(ll i=2;i<1000007;i++)fact[i]=(fact[i-1]*i)%MOD;}
    ll ncr(ll n,ll r) {ll res=1; res=fact[n]; res=(res*(expo(fact[r],MOD-2)))%MOD; res=(res*(expo(fact[n-r],MOD-2)))%MOD; return res;}
    ll npr(ll n,ll r) {facto(); ll res=1; res=fact[n]; res=(res*(expo(fact[n-r],MOD-2)))%MOD; return res; }
    int const N=1e5+9;
    ll const INF = 2e18+5;
   
    void solve()
    { 
        ll x;
        cin>>x;
        if(x>=30)
        {
            cout<<"Yes\n";
        }
        else
        {
            cout<<"No\n";
        }
        
    }

    int main()
    {
        fast
        // Sieve();
     //      freopen("std.in", "r", stdin);
 			 // freopen("std.out", "w", stdout);
 		 	// freopen("input.txt", "r", stdin);
			//    freopen("output.txt", "w", stdout);
        // ll g=1;
        // ct
        { 
            solve();
        }
    }