using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace ConsoleApplication1

{

    class Program

    {

        static void Main(string[] args)

        {

            cau3();

            Console.ReadKey();

        }

        static void cau1()

        {

            short sh = 9999;

            int sn = 99999999;

            long longg = 99999999999;

            bool bol = true;

            double db = 9.99999;

            float fl = 9f;

            Console.WriteLine("kieu short " + sh);

            Console.WriteLine("kieu so nguyen " + sn);

            Console.WriteLine("kieu long " + longg);

            Console.WriteLine("kieu bool " + bol);

            Console.WriteLine("kieu double " + db);

            int a, b;

            Console.Write("Nhap dai: ");

            a = int.Parse(Console.ReadLine());

            Console.Write("Nhap rong: ");

            b = int.Parse(Console.ReadLine());

            Console.WriteLine("Chi vi:" + (a + b) / 2);

            Console.WriteLine("Dien tich:" + (a * b));

        }

        static void cau2a()

        {

            string cachdoc = "";

            string[] a = { "khong", "mot", "hai", "ba", "bon", "nam", "sau", "bay", "tam", "chin" };

            int n = int.Parse(Console.ReadLine());

            int chuc = n / 10;

            int donvi = n % 10;

            if (chuc == 1)

            {

                cachdoc = " muoi ";

            }

            else

            {

                cachdoc = a[chuc] + " muoi ";

            }

            if (donvi != 0 && donvi != 5)

            {

                cachdoc += a[donvi];

            }

            if (donvi == 5)

            {

                cachdoc += " lam ";

            }

​

            Console.Write(cachdoc);

        }

        static void cau2b2()

        {

            int a = int.Parse(Console.ReadLine());

            int b = int.Parse(Console.ReadLine());

            char x = char.Parse(Console.ReadLine());

            switch (x)

            {

                case '+':

                    {

                        Console.WriteLine("{0}+{1}={2}", a, b, a + b);

                        break;

                    }

                case '-':

                    {

                        Console.WriteLine("{0}-{1}={2}", a, b, a - b);

                        break;

                    }

                case '*':

                    {

                        Console.WriteLine("{0}*{1}={2}", a, b, a * b);

                        break;

                    }

                case '/':

                    {

                        Console.WriteLine("{0}/{1}={2}", a, b, (double)a / b);

                        break;

                    }

            }

​

        }

        static void cau2b1()

        {

            int a = int.Parse(Console.ReadLine());

            int b = int.Parse(Console.ReadLine());

            Console.WriteLine("{0}+{1}={2}", a, b, a + b);

            Console.WriteLine("{0}-{1}={2}", a, b, a - b);

            Console.WriteLine("{0}*{1}={2}", a, b, a * b);

            Console.WriteLine("{0}/{1}={2}", a, b, (double)a / b);

        }

        static void cau2b3()

        {

            double a = double.Parse(Console.ReadLine());

            double b = double.Parse(Console.ReadLine());

            if (a == 0 && b == 0)

            {

                Console.Write("PT vo so nghiem");

            }

            else if (a == 0 && b != 0)

            {

                Console.Write("PT vo nghiem");

            }

            else

            {

                Console.Write("PT co 1 nghiem duy nhat: " + (-b / a));

            }

        }

        static void cau2b4()

        {

            double a = int.Parse(Console.ReadLine());

            double b = int.Parse(Console.ReadLine());

            double c = int.Parse(Console.ReadLine());

            double x1, x2;

            double delta = Math.Pow(b, 2) - 4 * a * c;

            if (delta > 0)

            {

                x1 = (-b + Math.Sqrt(delta)) / 2 * a;

                x2 = (-b - Math.Sqrt(delta)) / 2 * a;

            }

            else if (delta == 0)

            {

                x1 = x2 = -b / (2 * a);

            }

            else

            {

                Console.Write("PT vo nghiem");

            }

        }

        static void cau3()

        {

            int a;

            a = int.Parse(Console.ReadLine());

            int t = 0;

            for (int i = 1; i <= a; i++)

            {

                for (int z = 1; z <= (a / 2) + 1; z++)

                {

                    if (z <= i)

                    {

                        Console.Write("*");

                    }

                    if (i == (a / 2) + 1)

                    {

                        if (z < t-)

                        {

                            Console.Write("*");

                            t++;

                        }

                        else

                            Console.Write(" ");

                    }

                    else

                        Console.Write(" ");

                }

                Console.Write("\n");

            }

        }

    }

}

​