Number 0...100 to Text

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication51
{
    class Program
    {
        static void Main(string[] args)
        {
            var num = int.Parse(Console.ReadLine());
            if (num == 0)
            {
                Console.WriteLine("zero");
            }
            else if (num == 1)
            {
                Console.WriteLine("one");
            }
            else if (num == 2)
            {
                Console.WriteLine("two");
            }
            else if (num == 3)
            {
                Console.WriteLine("three");
            }
            else if (num == 4)
            {
                Console.WriteLine("four");
            }
            else if (num == 5)
            {
                Console.WriteLine("five");
            }
            else if (num == 6)
            {
                Console.WriteLine("six");
            }
            else if (num == 7)
            {
                Console.WriteLine("seven");
            }
            else if (num == 8)
            {
                Console.WriteLine("eight");
            }
            else if (num == 9)
            {
                Console.WriteLine("nine");
            }
            else if (num==10)
            {
                Console.WriteLine("ten");
            }
            else if (num == 11)
            {
                Console.WriteLine("eleven");
            }
            else if (num == 12)
            {
                Console.WriteLine("twelve");
            }
            else if (num == 13)
            {
                Console.WriteLine("thirteen");
            }
            else if (num == 14)
            {
                Console.WriteLine("fourteen");
            }
            else if (num == 15)
            {
               Console.WriteLine("fifteen");
            }
            else if (num == 16)
            {
                Console.WriteLine("sixteen");
            }
            else if (num == 17)
            {
                Console.WriteLine("seventeen");
            }
            else if (num == 18)
            {
                Console.WriteLine("eighteen");
            }
            else if (num == 19)
            {
                Console.WriteLine("nineteen");
            }
            else if (num==20)
            {
                Console.WriteLine("twenty");
            }
            else if (num == 21)
            {
                Console.WriteLine("twenty one");
            }
            else if (num == 22)
            {
                Console.WriteLine("twenty two");
            }
            else if (num == 23)
            {
                Console.WriteLine("twenty three");
            }
            else if (num == 24)
            {
                Console.WriteLine("twenty four");
            }
            else if (num == 25)
            {
                Console.WriteLine("twenty five");
            }
            else if (num == 26)
            {
                Console.WriteLine("twenty six");
            }
            else if (num == 27)
            {
                Console.WriteLine("twenty seven");
            }
            else if (num == 28)
            {
                Console.WriteLine("twenty eight");
            }
            else if (num == 29)
            {
                Console.WriteLine("twenty nine");
            }
            else if (num == 30)
            {
                Console.WriteLine("thirty");
            }
            else if (num == 31)
            {
                Console.WriteLine("thirty one");
            }
            else if (num == 32)
            {
                Console.WriteLine("thirty two");
            }
            else if (num == 33)
            {
                Console.WriteLine("thirty three");
            }
            else if (num == 34)
            {
                Console.WriteLine("thirty four");
            }
            else if (num == 35)
            {
                Console.WriteLine("thirty five");
            }
            else if (num == 36)
            {
                Console.WriteLine("thirty six");
            }
            else if (num == 37)
            {
                Console.WriteLine("thirty seven");
            }
            else if (num == 38)
            {
                Console.WriteLine("thirty eight");
            }
            else if (num == 39)
            {
                Console.WriteLine("thirty nine");
            }
            else if (num == 40)
            {
                Console.WriteLine("forty");
            }
             else if (num == 41)
            {
                Console.WriteLine("forty one");
            }
            else if (num == 42)
            {
                Console.WriteLine("forty two");
            }
            else if (num == 43)
            {
                Console.WriteLine("forty three");
            }
            else if (num == 44)
            {
                Console.WriteLine("forty four");
            }
            else if (num == 45)
            {
                Console.WriteLine("forty five");
            }
            else if (num == 46)
            {
                Console.WriteLine("forty six");
            }
            else if (num == 47)
            {
                Console.WriteLine("forty seven");
            }
            else if (num == 48)
            {
                Console.WriteLine("forty eight");
            }
            else if (num == 49)
            {
                Console.WriteLine("forty nine");
            }
            else if (num == 50)
            {
                Console.WriteLine("fifty");
            }
            else if (num == 51)
            {
                Console.WriteLine("fifty one");
            }
            else if (num == 52)
            {
                Console.WriteLine("fifty two");
            }
            else if (num == 53)
            {
                Console.WriteLine("fifty three");
            }
            else if (num == 54)
            {
                Console.WriteLine("fifty four");
            }
            else if (num == 55)
            {
                Console.WriteLine("fifty five");
            }
            else if (num == 56)
            {
                Console.WriteLine("fifty six");
            }
            else if (num == 57)
            {
                Console.WriteLine("fifty seven");
            }
            else if (num == 58)
            {
                Console.WriteLine("fifty eight");
            }
            else if (num == 59)
            {
                Console.WriteLine("fifty nine");
            }
            else if (num == 60)
            {
                Console.WriteLine("sixty");
            }
             else if (num == 61)
            {
                Console.WriteLine("sixty one");
            }
            else if (num == 62)
            {
                Console.WriteLine("sixty two");
            }
            else if (num == 63)
            {
                Console.WriteLine("sixty three");
            }
            else if (num == 64)
            {
                Console.WriteLine("sixty four");
            }
            else if (num == 65)
            {
                Console.WriteLine("sixty five");
            }
            else if (num == 66)
            {
                Console.WriteLine("sixty six");
            }
            else if (num == 67)
            {
                Console.WriteLine("sixty seven");
            }
            else if (num == 68)
            {
                Console.WriteLine("sixty eight");
            }
            else if (num == 69)
            {
                Console.WriteLine("sixty nine");
            }
            else if (num == 70)
            {
                Console.WriteLine("seventy");
            }
            else if (num == 71)
            {
                Console.WriteLine("seventy one");
            }
            else if (num == 72)
            {
                Console.WriteLine("seventy two");
            }
            else if (num == 73)
            {
                Console.WriteLine("seventy three");
            }
            else if (num == 74)
            {
                Console.WriteLine("seventy four");
            }
            else if (num == 75)
            {
                Console.WriteLine("seventy five");
            }
            else if (num == 76)
            {
                Console.WriteLine("seventy six");
            }
            else if (num == 77)
            {
                Console.WriteLine("seventy seven");
            }
            else if (num == 78)
            {
                Console.WriteLine("seventy eight");
            }
            else if (num == 79)
            {
                Console.WriteLine("seventy nine");
            }
            else if (num == 80)
            {
                Console.WriteLine("eighty");
            }
            else if (num == 81)
            {
                Console.WriteLine("eighty one");
            }
            else if (num == 82)
            {
                Console.WriteLine("eighty two");
            }
            else if (num == 83)
            {
                Console.WriteLine("eighty three");
            }
            else if (num == 84)
            {
                Console.WriteLine("eighty four");
            }
            else if (num == 85)
            {
                Console.WriteLine("eighty five");
            }
            else if (num == 86)
            {
                Console.WriteLine("eighty six");
            }
            else if (num == 87)
            {
                Console.WriteLine("eighty seven");
            }
            else if (num == 88)
            {
                Console.WriteLine("eighty eight");
            }
            else if (num == 89)
            {
                Console.WriteLine("eighty nine");
            }
            else if (num == 90)
            {
                Console.WriteLine("ninety");
            }
            else if (num == 91)
            {
                Console.WriteLine("ninety one");
            }
            else if (num == 92)
            {
                Console.WriteLine("ninety two");
            }
            else if (num == 93)
            {
                Console.WriteLine("ninety three");
            }
            else if (num == 94)
            {
                Console.WriteLine("ninety four");
            }
            else if (num == 95)
            {
                Console.WriteLine("ninety five");
            }
            else if (num == 96)
            {
                Console.WriteLine("ninety six");
            }
            else if (num == 97)
            {
                Console.WriteLine("ninety seven");
            }
            else if (num == 98)
            {
                Console.WriteLine("ninety eight");
            }
            else if (num == 99)
            {
                Console.WriteLine("ninety nine");
            }
            else if (num == 100)
            {
                Console.WriteLine("one hundred");
            }
             else
            {
                Console.WriteLine("invalid number");
            }
        }
    }
}