d1 = {'the': 3, 'fine': 4, 'word': 2}
d2 = {'the': 2, 'fine': 4, 'word': 1, 'knight': 1, 'orange': 1}
d3 = {'the': 5, 'fine': 8, 'word': 3, 'sequel': 1, 'jimbo': 1}
c = Counter()
for d in (d1, d2, d3):
    c.update(d)
print(c)
How can I concatenate dicts (values to values of the same key and new key)?