Disk

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

namespace novo2
{
    class Program
    {
        static int a;
        static void Main(string[] args)
        {
            int sizeOfTheField;
            sizeOfTheField = int.Parse(Console.ReadLine());
            int radiusOfTheDisk;
            char point = '.';
            char star = '*';
            int center = sizeOfTheField / 2;
            radiusOfTheDisk = int.Parse(Console.ReadLine());
            for (int j = 0; j < sizeOfTheField; j++)
            {
                for (int i = 0; i < sizeOfTheField; i++)
            {
                double distance = Math.Sqrt(Math.Pow(center - i, 2) + Math.Pow(center - j, 2));
                if (distance <= radiusOfTheDisk)
                {
                    Console.Write(star);
                }
                else
                {
                    Console.Write(point);
                }
            }
                Console.WriteLine();
            }
            }
        }
    }