Write a function to get nth element of the fibonacci series

Solution

def fibonacci_nth(n):
    a = 0
    b = 1
    
    if n <= 0: 
        print("Incorrect input")
    elif n==1: 
        return a
    elif n==1: 
        return 1
    else: 
        for i in range(2, n):
            c = a + b
            a, b = b, c
        return b