Compile a Python program to retrieve the nth Fibonacci number in the series.
5
def Fibonacci(n): 
    if n<0: 
        print("Incorrect input") 
    elif n==1: 
        return 0
    elif n==2: 
        return 1
    else: 
        return Fibonacci(n-1)+Fibonacci(n-2) 
  
num = 5
print(Fibonacci(num))