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 Python3 (judge verdict: Runtime Error)

# -*- coding: utf-8 -*-
 
 
def main(n):
    lst = []
    lst.append(1)
    lst.append(1)
    for i in range(2, n + 1):
        lst[i] = lst[i - 1] + lst[i - 2]
    return lst[n]
 

if __name__ == '__main__': 
    n = int(input())
    print(main(n))