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 Scala (judge verdict: Time Limit Exceeded)

object Main{
  def fibnacchi(n : Int): Int = if(n == 1)
      return 1
    else if(n == 0)
      return 1
    else
      return fibnacchi(n-1) + fibnacchi(n-2)
  def main(args:Array[String]) = {
    val num = scala.io.StdIn.readLine.toInt;
    println(fibnacchi(num))
  }
}