using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication27
{
class Program
{
static void Main(string[] args)
{
int n = 10;
int a, b, c;
a = 1; c = n - 1;
for (int i = 0; i < n * 2 - 1; i++)
{
if (i < n)
{
for (int j = 0; j < n * 2 - 1; j++)
{
b = n - a;
if ((j < b) || (j >= (b + 2 * a - 1)))
{
Console.Write("@");
}
else
{
Console.Write(" ");
}
}
a = a + 1;
}
else
{
for (int j = 0; j < n * 2 - 1; j++)
{
b = n - c;
if ((j < b) || (j >= (b + 2 * c - 1)))
{
Console.Write("@");
}
else
{
Console.Write(" ");
}
}
c = c - 1;
}
Console.WriteLine();
}
Console.ReadLine();
}
}
}
