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 Java (OpenJDK 11.0.6) (judge verdict: Accepted)

/*
    Author: @__goku__
    ssrivastava990@gmail.com

                   `\-.   `
                      \ `.  `
                       \  \ |
              __.._    |   \.       S O N - G O K U
       ..---~~     ~ . |    Y
         ~-.          `|    |
            `.               `~~--.
              \                    ~.
               \                     \__. . -- -  .
         .-~~~~~      ,    ,            ~~~~~~---...._
      .-~___        ,'/  ,'/ ,'\          __...---~~~
            ~-.    /._\_( ,(/_. 7,-.    ~~---...__
           _...>-  P""6=`_/"6"~   6)    ___...--~~~
            ~~--._ \`--') `---'   9'  _..--~~~
                  ~\ ~~/_  ~~~   /`-.--~~
                    `.  ---    .'   \_
                      `. " _.-'     | ~-.,-------._
                  ..._../~~   ./       .-'    .-~~~-.
            ,--~~~ ,'...\` _./.----~~.'/    /'       `-
        _.-(      |\    `/~ _____..-' /    /      _.-~~`.
       /   |     /. ^---~~~~       ' /    /     ,'  ~.   \
      (    /    (  .           _ ' /'    /    ,/      \   )
      (`. |     `\   - - - - ~   /'      (   /         .  |
       \.\|       \            /'        \  |`.           /
       /.'\\      `\         /'           ~-\         .  /\
      /,   (        `\     /'                `.___..-      \
     | |    \         `\_/'                  //      \.     |
     | |     |                 _Seal_      /' |       |     |
 */

import java.io.*;
import java.util.*;

public class Main
{
    static PrintWriter out = new PrintWriter((System.out));

    public static void main(String args[]) throws IOException
    {
        Kioken sc = new Kioken();
        int n=sc.nextInt();
        if(n>=30)
        {
            out.println("Yes");
        }
        else
        {
            out.println("No");
        }
        out.close();
    }

    public static void kamehameha()
    {
    }

    public static int lower_bound(ArrayList<Integer> ar, int k)
    {
        int s = 0, e = ar.size();
        while (s != e)
        {
            int mid = s + e >> 1;
            if (ar.get(mid) <= k)
            {
                s = mid + 1;
            }
            else
            {
                e = mid;
            }
        }
        return Math.abs(s) - 1;
    }

    public static int upper_bound(ArrayList<Integer> ar, int k)
    {
        int s = 0;
        int e = ar.size();
        while (s != e)
        {
            int mid = s + e >> 1;
            if (ar.get(mid) < k)
            {
                s = mid + 1;
            }
            else
            {
                e = mid;
            }
        }
        if (s == ar.size())
        {
            return -1;
        }
        return s;
    }

    static class Kioken
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer("");

        public String next()
        {
            while (!st.hasMoreTokens())
            {
                try
                {
                    st = new StringTokenizer(br.readLine());
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        public int nextInt()
        {
            return Integer.parseInt(next());
        }

        public long nextLong()
        {
            return Long.parseLong(next());
        }

        public double nextDouble()
        {
            return Double.parseDouble(next());
        }

        public String nextLine()
        {
            try
            {
                return br.readLine();
            }
            catch (Exception e)
            {
                e.printStackTrace();
            }
            return null;
        }

        public boolean hasNext()
        {
            String next = null;
            try
            {
                next = br.readLine();
            }
            catch (Exception e)
            {
            }
            if (next == null || next.length() == 0)
            {
                return false;
            }
            st = new StringTokenizer(next);
            return true;
        }
    }
}