using System;

public class Program

{

    public static void Main()

    {

        string userid,passward;

        int count=1;    

        Console.WriteLine("    Login Page");

        Console.WriteLine("---------------------");

        while(count<=3)

        {

        Console.WriteLine("User Id");

        userid=Console.ReadLine();

        Console.WriteLine("Passward");

            passward=Console.ReadLine();

        if((userid =="manu") && (passward=="1234"))

        {

            Console.WriteLine("Hi "+userid);

            break;

        }

            count++;

        }

        {

            String chs;

            double fst,snd;

        Console.WriteLine("   Select your Option");

        Console.WriteLine("--------------------------");

        Console.WriteLine("1 Simple Maths");            

        Console.WriteLine("2 Perimeter Cal");

        Console.WriteLine("3 Square Cal");

        Console.WriteLine("0 Exit");

        chs=Console.ReadLine();

            if (chs=="1")

            {

            Console.WriteLine("----------------------------");

            Console.WriteLine("      1 Simple Maths");

            Console.WriteLine("----------------------------");

                Console.WriteLine("1. Addition");

                Console.WriteLine("2. Subtraction");

                Console.WriteLine("3. Multiplication");

                Console.WriteLine("4. Division");

                Console.WriteLine("0. Back");//No Idea Sir please Give your idea how to come back to the prvious menu

            Console.WriteLine("Chose Your Any of Above");

                int sel=Convert.ToInt16(Console.ReadLine());

                Console.WriteLine("Enter the Frist Value");

                fst=Convert.ToInt16(Console.ReadLine());

                Console.WriteLine("Enter the Scnd Value");

                snd=Convert.ToInt16(Console.ReadLine());

                switch(sel)

                {

                    case 1:Console.WriteLine("Addition {0}+{1}={2}",fst,snd,(fst+snd));

                    break;

                    case 2:Console.WriteLine("Subtraction {0}-{1}={2}",fst,snd,(fst-snd));

                    break;

                    case 3:Console.WriteLine("Multiplication {0}X{1}={2}",fst,snd,(fst*snd));

                    break;

                    case 4:Console.WriteLine("Division {0}/{1}={2}",fst,snd,(fst/snd));

                    break;

                }

            }

            else if(chs=="2")

            {

                double side1,side2,side3,rds;

                Console.WriteLine("-----------------------");

                Console.WriteLine("      2 Perimeter Cal");

                Console.WriteLine("-----------------------");

                Console.WriteLine("Chose type of Shape");

                Console.WriteLine("1 Square");//implementing Sir

                Console.WriteLine("2 Rectangle");//implementing Sir

                Console.WriteLine("3 Triangle");//implementing Sir

                Console.WriteLine("4 Cicrcle");//implementing Sir

                Console.WriteLine("0 Back");//No Idea Sir please Give your idea how to come back to the prvious menu

                chs=Console.ReadLine();

                if(chs=="1")

                {

                    Console.WriteLine("--------------------");

                    Console.WriteLine("        1 Square");

                    Console.WriteLine("--------------------");

                    Console.WriteLine("Lenth Of A Side");

                    side1=Convert.ToInt16(Console.ReadLine());

                    Console.WriteLine("Peremeter Of this Square is = "+4*side1);

                }

                else if(chs=="2")

                {

                    Console.WriteLine("--------------------");

                    Console.WriteLine("     2 Rectangle");

                    Console.WriteLine("--------------------");

                    Console.WriteLine("Lenth Of A Side");                   

                    side1=Convert.ToInt16(Console.ReadLine());

                    Console.WriteLine("Lenth Of A Side");                   

                    side2=Convert.ToInt16(Console.ReadLine());

                    Console.WriteLine("Peremeter Of this Square is = "+side1*side2);                

                }

                else if(chs=="3")

                {

                    Console.WriteLine("-----------------------");

                    Console.WriteLine("      3 Triangle");

                    Console.WriteLine("-----------------------");

                    Console.WriteLine("Value Of A side");

                    side1=Convert.ToInt16(Console.ReadLine());

                    Console.WriteLine("Value Of B side");

                    side2=Convert.ToInt16(Console.ReadLine());

                    Console.WriteLine("Value Of C side");

                    side3=Convert.ToInt16(Console.ReadLine());

                    Console.WriteLine("A="+side1);

                    Console.WriteLine("Perimeter {0}+{1}+{2}={3}",side1,side2,side3,(side1)+(side2)+(side3));

                }

                else if(chs=="4")

                {

                    Console.WriteLine("-----------------------");

                    Console.WriteLine("     3 Cicrcle");

                    Console.WriteLine("-----------------------");

                    Console.WriteLine("Radis Of the Cicrcle");

                    rds=Convert.ToDouble(Console.ReadLine());

                    Console.WriteLine("Peremeter = "+(2*3.14159*rds));

                }

                else

                {

                Console.WriteLine("Chose Correct Option");

                }

            }

            else if(chs=="3")

            {

                Console.WriteLine("-----------------------");

            Console.WriteLine("       3 Square Cal");

                Console.WriteLine("------------------------");

                Console.WriteLine("Chose Type of Area Shape");

                Console.WriteLine("1 Square ");

                Console.WriteLine("2 Rectangle ");

                Console.WriteLine("3 Triangle");

                Console.WriteLine("5 Cercle");

                Console.WriteLine("0 Back");

                Console.ReadLine();

            }

            else

            {

            Console.WriteLine("Chose right Option");

            }

        }

    }

}