JAVA-from-class

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

namespace Java
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            for (int i = 0; i < n; i++)
                Console.WriteLine(new string(' ', n) + "~ ~ ~");
            string ravno = new string('=', 3 * n + 5);
            Console.WriteLine(ravno);
            if (n % 2 != 0)
                for (int i = 0; i < (n-3)/2; i++)
                {
                    Console.WriteLine("|" + new string('~', n * 2 + 4)  + "|" + new string(' ', n - 1) + "|");
                }
            else
                for (int i = 0; i < (n - 3) / 2 + 1; i++)
                {
                    Console.WriteLine("|" + new string('~', n * 2 + 4) + "|" + new string(' ', n - 1) + "|");
                }
            Console.WriteLine("|" + new string('~',n)+ "JAVA" + new string('~', n) + "|" + new string (' ', n-1) + "|");
            for (int i = 0; i < (n - 3) / 2; i++)
            {
                Console.WriteLine("|" + new string('~', n * 2 + 4) + "|" + new string(' ', n - 1) + "|");
            }
            Console.WriteLine(ravno);
            for (int i = 0; i < n; i++)
            {
                string spaces = new string(' ', i);
                string row = "\\" + new string('@', n * 2 + 4 - 2 * i) + "/";
                Console.WriteLine(spaces + row);
            }
            Console.WriteLine(new string('=', n*2 + 6));
        }
    }
}