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)

import javax.swing.*;
import java.io.*;
import java.math.BigInteger;
import java.util.*;


public class Main {
    static PrintWriter out = new PrintWriter(System.out);
    static long[] tree;
    static int m = 100000000;
    static int k1,k2;
    static boolean[] vis;
    static tuple[] tuples;
    static char[] a,b;
    public static void main(String[] args) throws IOException {
        //BufferedReader reader=new BufferedReader(new FileReader("input.txt"));
        //PrintWriter pw=new PrintWriter(new BufferedWriter(new FileWriter("output.txt")));
        //BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        //Scanner sc=new Scanner(System.in);
        Reader sc = new Reader();
        //String[] in=reader.readLine().split(" ");

        int n=sc.nextInt();
        if (n>=30) System.out.println("Yes");
        else System.out.println("No");



















        out.close();
    }
    static Integer[][] memo ;
    static int lcs(int i,int j){
        if (i==a.length || j==b.length)
            return 0;
        else if (memo[i][j]!=null)return memo[i][j];
        else if (a[i]==b[j])
            return memo[i][j]=1+lcs(i+1,j+1);
        else
            return Math.max(lcs(i+1,j),lcs(i,j+1));
    }



    static boolean bfs(int a,int b){
        Queue<Integer> queue=new LinkedList<>();
        queue.add(a);

        while (!queue.isEmpty()){
            int now=queue.poll();
            vis[now]=true;

            for (int i = 0; i <k1 ; i++) {
                if (!vis[i]){
                    if((tuples[i].a<tuples[now].a&&tuples[now].a<tuples[i].b)
                            ||(tuples[i].a<tuples[now].b&&tuples[now].b<tuples[i].b)){
                        queue.add(i);
                        if (i==b){
                            Arrays.fill(vis,false);
                            return true;
                        }
                    }
                }
            }
        }

        Arrays.fill(vis,false);
        return false;

    }
    static int find(int[] p,int x){
        if (p[x]==x)return x;

        return p[x]=find(p,p[x]);
    }
    static void union(int[] p,int a,int b){
        p[find(p,b)]=find(p,a);
    }
    static void built(long[] a,int at,int l,int r,int n){
        if (l==r){
            tree[at]=a[l];
        }
        else {
            int mid=(l+r)/2;
            int right=2*at;
            int left=(2*at)+1;
            built(a,left,l,mid,n-1);
            built(a,right,mid+1,r,n-1);
            if (n%2==0)
                tree[at]=tree[left]^tree[right];
            else
                tree[at]=tree[left]|tree[right];
        }
    }
    static void update(int at,int l,int r,int i,long v,int n){
        if (i<l || i>r)return;

        if (l==r){
            tree[at]=v;
        }
        else {
            int mid=(l+r)/2;
            int right=2*at;
            int left=(2*at)+1;
            update(left,l,mid,i,v,n-1);
            update(right,mid+1,r,i,v,n-1);
            if (n%2==0)
                tree[at]=tree[left]^tree[right];
            else
                tree[at]=tree[left]|tree[right];
        }
    }




}

class node implements Comparable<node> {
    Integer no;
    Integer cost;
    Vector<node> adj = new Vector<>();

    public node(Integer no, Integer cost) {
        this.no = no;
        this.cost = cost;
    }

    @Override
    public String toString() {
        return "node{" +
                "no=" + no +
                ", cost=" + cost +
                '}';
    }

    @Override
    public int compareTo(node o) {
        return o.cost - this.cost;
    }
}

class edge implements Comparable<edge> {
    tuple u;
    Double cost;

    public edge(tuple u, Double cost) {
        this.u = u;
        this.cost = cost;
    }

    @Override
    public int compareTo(edge o) {
        return this.cost.compareTo(o.cost);
    }

    @Override
    public String toString() {
        return "edge{" +
                "u=" + u +
                ", cost=" + cost +
                '}';
    }
}

///*
class tuple implements Comparable<tuple> {
    Integer a;
    Integer b;

    public tuple(Integer a, Integer b) {
        this.a = a;
        this.b = b;
    }

    @Override
    public int compareTo(tuple o) {
        return (int) (this.b - o.b);
    }

    @Override
    public String toString() {
        return "tuple{" +
                "a=" + a +
                ", b=" + b +
                '}';
    }
}


//*/
class Reader {
    final private int BUFFER_SIZE = 1 << 16;
    private DataInputStream din;
    private byte[] buffer;
    private int bufferPointer, bytesRead;

    public Reader() {
        din = new DataInputStream(System.in);
        buffer = new byte[BUFFER_SIZE];
        bufferPointer = bytesRead = 0;
    }

    public Reader(String file_name) throws IOException {
        din = new DataInputStream(new FileInputStream(file_name));
        buffer = new byte[BUFFER_SIZE];
        bufferPointer = bytesRead = 0;
    }

    public String readLine() throws IOException {
        byte[] buf = new byte[64];
        int cnt = 0, c;
        while ((c = read()) != -1) {
            if (c == '\n') break;
            buf[cnt++] = (byte) c;
        }
        return new String(buf, 0, cnt);
    }

    public int nextInt() throws IOException {
        int ret = 0;
        byte c = read();
        while (c <= ' ') c = read();
        boolean neg = (c == '-');
        if (neg) c = read();
        do {
            ret = ret * 10 + c - '0';
        } while ((c = read()) >= '0' && c <= '9');
        if (neg) return -ret;
        return ret;
    }

    public long nextLong() throws IOException {
        long ret = 0;
        byte c = read();
        while (c <= ' ') c = read();
        boolean neg = (c == '-');
        if (neg) c = read();
        do {
            ret = ret * 10 + c - '0';
        } while ((c = read()) >= '0' && c <= '9');
        if (neg) return -ret;
        return ret;
    }

    public double nextDouble() throws IOException {
        double ret = 0, div = 1;
        byte c = read();
        while (c <= ' ') c = read();
        boolean neg = (c == '-');
        if (neg) c = read();
        do {
            ret = ret * 10 + c - '0';
        } while ((c = read()) >= '0' && c <= '9');
        if (c == '.') while ((c = read()) >= '0' && c <= '9') ret += (c - '0') / (div *= 10);
        if (neg) return -ret;
        return ret;
    }

    private void fillBuffer() throws IOException {
        bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
        if (bytesRead == -1) buffer[0] = -1;
    }

    private byte read() throws IOException {
        if (bufferPointer == bytesRead) fillBuffer();
        return buffer[bufferPointer++];
    }

    public void close() throws IOException {
        if (din == null) return;
        din.close();
    }
}