07.00 Console Graphics

using System;
class Program
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        Console.WriteLine("{0}", new String('*', 2 * n));
        Console.WriteLine("{0}", new String('*', 2 * n));

        for (int i = 0; i < n - 1; i++)
        {
            Console.WriteLine("{0}{1}{0}", new String('*', n / 2 + 1), new string(' ', n - 1));
        }
        Console.WriteLine("{0}", new String('~', 2 * n));
        Console.WriteLine("{0}", new String('~', 2 * n));
    }
}