Fibonacci series or not ?

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Fibanocci

{

    class Program

    {

       static void Main(string[] args)

       {

           int num,num1=0,num2=1,sum;

           int number,j=0;

           number=Int32.Parse(Console.ReadLine());

           for(num=2;num<number;num++)

           {

               sum=num1+num2;

               num1=num2;

               num2 =sum;

              if(sum==number)

              {

                  j=1;

              

             

               Console.WriteLine("fibonnaci series " + sum);

              }

           }

               if(j==1)

               

           Console.WriteLine("no is fibonnaci"+number);

                   else

                   

               Console.WriteLine("no is not fibbinaocci"+number);

               

               }

           }

       }