using System;

​

public class Program

{

    public static void Main()

    {

        //Q12. Write a C# program Fibonacci Numbers to print numbers upto N, where N is a number input by the user.

        //Test Data :

        //Enter a number : 8

        //Expected Output :

        //First 8 Fibonacci Numbers are : 1 1 2 3 5 8 13 21

        //Hint: The formula to form the Fibonacci sequence is:

        //F0 = 1

        //F1 = 1

        //Fn = Fn-1 + Fn-2

        int a = 1;

        int b = 1;

        int c = a + b;

        Console.Write("Enter a number:");

        int n = Int32.Parse(Console.ReadLine());

        Console.Write("First {0} Fibonacci Numbers are:", n);

        Console.Write(a);

        Console.Write(b);

        for (int i = 1; i < n - 1; i++)

        {

            Console.Write(c);

            a = b;

            b = c;

            c = a + b;

        }

    }

}