Nth Fibonacci number

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Level EASY

Nth term of fibonacci series F(n) is calculated using following formula -

    F(n) = F(n-1) + F(n-2), 
    Where, F(1) = F(2) = 1

Provided N you have to find out the Nth Fibonacci Number.

Input Format :
Integer n
Output Format :
Nth Fibonacci term i.e. F(n)
Constraints:
1 <= n <= 25
Sample Input 1:
4
Sample Output 2:
3
Sample Input 1:
6
Sample Output 2:
8

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