Problem:
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Fibonacci Number

Write a program which prints $n$-th fibonacci number for a given integer $n$. The $n$-th fibonacci number is defined by the following recursive formula:

\begin{equation*}
fib(n)= \left \{
\begin{array}{ll}
1　 & (n = 0) \\
1　 & (n = 1) \\
fib(n - 1) + fib(n - 2) & \\
\end{array}
\right.
\end{equation*}

Input

An integer $n$ is given.

output

Print the $n$-th fibonacci number in a line.

Constraints

$0 \leq n \leq 44$

Sample Input 1

3

Sample Output 1

3

Solution in C# (judge verdict: Accepted)

using System;

namespace ALDS1_10_A_FibonacciNumber
{
	class Program
	{
		static void Main ( string[] args )
		{
			int inputNum = int.Parse (Console.ReadLine ());

			int[] numArray = new int[inputNum + 1];
			numArray[0] = 1;
			numArray[1] = 1;

			for (int index = 2; index <= inputNum; index++)
			{
				numArray[index] = numArray[index - 1] + numArray[index - 2];
			}

			Console.WriteLine (numArray[inputNum]);
		}
	}
}