#include <iostream>
#include <cstdio>
using namespace std;

int main()
{
	int F[45],n;
	F[0] = F[1] = 1;
	for (int i = 2; i <= 44; i++)
		F[i] = F[i - 1] + F[i - 2];
	scanf("%d", &n);
	printf("%d\n", F[n]);
	return 0;
}
### Prompt

Create a solution in Cpp for the following problem:

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*}

Constraints

* $0 \leq n \leq 44$

Input

An integer $n$ is given.

Example

Input

3


Output

3

### Response

```cpp
#include <iostream>
#include <cstdio>
using namespace std;

int main()
{
	int F[45],n;
	F[0] = F[1] = 1;
	for (int i = 2; i <= 44; i++)
		F[i] = F[i - 1] + F[i - 2];
	scanf("%d", &n);
	printf("%d\n", F[n]);
	return 0;
}
```