task 4/5 most_courses, throws Bummer Try again error

# The dictionary will look something like:
# {'Andrew Chalkley': ['jQuery Basics', 'Node.js Basics'],
#  'Kenneth Love': ['Python Basics', 'Python Collections']}
#
# Each key will be a Teacher and the value will be a list of courses.
#
# Your code goes below here.
def num_teachers(dict1):
    return len(dict1.keys())

def num_courses(dict1):
    count = 0
    for i in dict1.keys():
        count += len(dict1[i])
    return count    

def courses(dict1):
    course_list = []
    for i in dict1.keys():
        for j in dict1[i]:
            course_list.append(j)
    return course_list        

def most_courses(dict1):
    max_count = 0
    teacher = ""
    for i in dict1.keys():
        if max_count < len(dict1[i]):
            max_count = len(dict1[i])
            teacher = i
    return teacher