Zadacha 1 Class

using System;

namespace ConsoleApp3
{
    class Program
    {
        class Rectan
        {
            private int a, b;
            public Rectan (int a1, int b1)
            {
                a = a1; b = b1;
            }
            public void Rectan1()
            {
                a = 0; b = 0;
            }
            public int Rectan2
            {
                set
                {
                    a = value;b = value;
                }
            }
            public int Area
            {
                get
                {
                    return  a * b;
                }
            }
        }
        static void Main(string[] args)
        {
            Rectan R1 = new Rectan(3,5);
            int k = int.Parse(Console.ReadLine());
            int k1 = int.Parse(Console.ReadLine());
            Rectan R2 = new Rectan(k, k1);
            Rectan R3 = new Rectan(4, 6);
            Console.WriteLine("S1 = " + R1.Area);
            Console.WriteLine("S2 = " + R2.Area);
            Console.WriteLine("S3 = " + R3.Area);
            int S1 = R1.Area;
            int S2 = R2.Area;
            int S3 = R3.Area;
            if (S1 > S2 && S1 > S3) Console.WriteLine("Max Area is: " + S1);
            else if (S2 > S3) Console.WriteLine("Max Area is: " + S2);
            else Console.WriteLine("Max Area is: " + S3);
        }
    }
}