using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using static System.Math;
namespace AtCoder_1
{
    class Program
    {
        static void Main(string[] args)
        {
            var n = CinT;
            if(n >= 30)
            {
                Cout = Yes;
            }
            else
            {
                Cout = No;
            }


            Wait();
        } //main

        static readonly int MOD10_9_7 = (1000000000 + 7);
        static Random Rand = new Random();
        static readonly string Yes = "Yes";
        static readonly string No = "No";
        static readonly char[] AlphTab = new char[] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
        static int GetDigits(long num) { return (int)Floor(Log10(num)) + 1; }
        static int GetNumByDigit(long num, int digit) { return (int)((num / ((int)Pow(10, digit - 1))) % 10); }
        static int Loop(int num, int max)
        {
            if (num > max) { return num % max - 1; }
            else if (num < 0) { return max - (-num) % max + 1; }
            else { return num; }
        }
        static long PW10(int n) { return (long)Pow(10, n); }
        static long GCD(long a, long b)
        {
            if (a < b) { return GCD(b, a); }
            if (a % b == 0) { return b; }
            else { return GCD(b, a % b); }
        }
        static long LCM(long a, long b) { return a * b / GCD(a, b); }
        static void Swap<T>(ref T a, ref T b) { T t = a; a = b; b = t; }
        static void SwapArE<T>(T[] a, int i, int j) { T t = a[i]; a[i] = a[j]; a[j] = t; }
        static void SwapLiE<T>(List<T> a, int i, int j) { T t = a[i]; a[i] = a[j]; a[j] = t; }
        static bool IsInt(double d) { return (int)d == d; }
        static string Wait() { return Console.ReadLine(); }
        static string Cin { get { return Wait(); } }
        static string[] CinAr { get { return Cin.Split(' ').Where(x => x != "").ToArray(); } }
        static int CinT { get { return S2i(Cin); } }
        static int[] CinTAr { get { return CinAr.Select((x, i) => { return S2i(x); }).ToArray(); } }
        static long CinL { get { return S2L(Cin); } }
        static long[] CinLAr { get { return CinAr.Select((x, i) => { return S2L(x); }).ToArray(); } }
        static double CinD { get { return S2D(Cin); } }
        static double[] CinDAr { get { return CinAr.Select((x, i) => { return S2D(x); }).ToArray(); } }
        static int S2i(string s) { return int.Parse(s); }
        static long S2L(string s) { return long.Parse(s); }
        static double S2D(string s) { return double.Parse(s); }
        static object Cout{ set { Console.WriteLine(value); } }
        static object WCout{ set { Console.Write(value); } }
        static string RevStr(string s) { return new string(s.Reverse().ToArray()); }
        static void AFOR(long max, Action<long> Act_I) { for(long i = 0;i < max; i++) { Act_I(i); } }
        static void AFOR(long max, Action Act) { for(long i = 0;i < max; i++) { Act(); } }
        static long[] Divisor(long n)
        {
            if (n == 1) { return new long[] { 1 }; }
            List<long> res = new List<long>() { 1, n };
            for (long i = 2; i <= Sqrt(n); i++)
            {
                if (n % i == 0)
                {
                    res.Add(i);
                    long f = n / i;
                    if (f != i) { res.Add(f); }
                }
            }
            return res.ToArray();
        }
        static IEnumerable<decimal> PrimeFactors(decimal n)
        {
            decimal i = 2, tmp = n;
            while (i * i <= n)
            {
                if (tmp % i == 0)
                {
                    tmp /= i;
                    yield return i;
                } else { i++; }
            }
            if (tmp != 1) { yield return tmp; }
        }
        static bool IsPrime(long num)
        {
            if (num == 1) { return false; }
            for (long i = 2; i <= Sqrt(num) + 1; i++) { if (num % i == 0) { return false; } }
            return true;
        }
        static void CoutAr<Type>(IEnumerable<Type> types) { Cout = string.Join(" ", types); }
        static long nCr(int n, int r) { return nPr(n, r) / Factorial(r); }
        static long nPr(int n, int r) { return FactorialDivision(n, n - r); }
        static long FactorialDivision(int tf, int df)
        {
            long r = 1;
            for (int i = tf; i > df; i--) { r *= i; }
            return r;
        }
        static long Factorial(int i)
        {
            if (i <= 1) { return 1; }
            return i * Factorial(i - 1);
        }
        static void CoutMemPairAr<Type>(IEnumerable<Pair<Type>> pairs) { CoutAr(pairs.Select(x => $"({x.a}, {x.b}, {x.c})")); }
    }
    public struct Pair<T>
    {
        public T a, b, c;
        public Pair(T _a, T _b, T _c = default(T)) { a = _a; b = _b; c = _c; }
    }
}


Measured memory_bytes: 18380