Given a number **n**, return the number of positive odd numbers below **n**, EASY!
Expect large Inputs!
def odd_count(n):
    # This work on test but takes too much time. 
    #counter = 0
    #for num in range(0, n): 
    #     if num % 2 != 0: 
    #        counter += 1
    return len(range(1, n,2))
def odd_count(n):
    # This work on test but takes too much time. 
    #counter = 0
    #for num in range(0, n): 
    #     if num % 2 != 0: 
    #        counter += 1
    return len(range(1, n,2))