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: Time Limit Exceeded)

#include<stdio.h>

int fib( int);
int main() {
	int n,i;
	
	scanf("%d",&n);
	
	

	printf("%d\n",fib(n));
	
	return 0;
}
	
	
	
	int fib(int n) {
		if(n==1  || n==0) return 1;
		
		else return fib(n-2)+fib(n-1);
		
		
		}