def how_many(animals):
    l=0
    for k,v in animals.items():
        l=l+len(v)
    return l

animals = { 'a': ['aardvark'], 'b': ['baboon'], 'c': ['coati']}
animals['d'] = ['donkey']
animals['d'].append('dog')
animals['d'].append('dingo')
print(how_many(animals))