PointInTheFigure

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

namespace _16.Number0100ToText
{
    class Number0100ToText
    {
        static void Main(string[] args)
        {
            int size = int.Parse(Console.ReadLine());
            int x = int.Parse(Console.ReadLine());
            int y = int.Parse(Console.ReadLine());

            int firstRectangleX1 = 0;
            int firstRectangleX2 = size * 3;
            int firstRectangleY1 = 0;
            int firstRectangleY2 = size;

            int secondRectangleX1 = size;
            int secondRectangleX2 = size * 2;
            int secondRectangleY1 = size;
            int secondRectangleY2 = size * 4;

            bool isInsideFirst = x > firstRectangleX1 &&
                                 x < firstRectangleX2 &&
                                 y > firstRectangleY1 &&
                                 y < firstRectangleY2;
            bool isOnTheBorderOfTheFirst = ((x == firstRectangleX1 || x == firstRectangleX2) && (y >= firstRectangleY1 && y <= firstRectangleY2)) ||
                                           ((y == firstRectangleY1 || y == firstRectangleY2) && (x >= firstRectangleX1 && x <= firstRectangleX2));

            bool isInsideSecond = x > secondRectangleX1 &&
                                  x < secondRectangleX2 &&
                                  y >= secondRectangleY1 &&
                                  y < secondRectangleY2; ;
            bool isOnTheBorderOfTheSecond = ((x == secondRectangleX1 || x == secondRectangleX2) && (y >= secondRectangleY1 && y <= secondRectangleY2)) ||
                                            ((y == secondRectangleY1 || y == secondRectangleY2) && (x >= secondRectangleX1 && x <= secondRectangleX2));

            string result = string.Empty;
            if (isInsideFirst || isInsideSecond)
            {
                result = "inside";
            }
            else if (isOnTheBorderOfTheFirst || isOnTheBorderOfTheSecond)
            {
                result = "border";
            }
            else
            {
                result = "outside";
            }

            Console.WriteLine(result);
        }
    }
}