where's 'num_teachers()'

# The dictionary will be something like:
# {'Jason Seifer': ['Ruby Foundations', 'Ruby on Rails Forms', 'Technology Foundations'],
#  'Kenneth Love': ['Python Basics', 'Python Collections']}
#
# Often, it's a good idea to hold onto a max_count variable.
# Update it when you find a teacher with more classes than
# the current count. Better hold onto the teacher name somewhere
# too!
#
# Your code goes below here.

def most_classes(teachers):
  m=0
  for tea in teachers:
    x=len(teachers[tea])
    if m<x:
      name=tea
      m=x
  return name

def num_teachers(teachers):
  for tea in teachers:
    x+=1
  return x