# Print max sum of values

my_dict = {
    'a': [1, 2, 3],
    'b': [4, 0, -4],
    'c': [3, 5, 9],
    'd': [45, 12, 100]
}
max_sum = None

for max_value in my_dict.values():
    list_sum = sum(max_value)

    if max_sum is None:
        max_sum = list_sum
    elif max_sum < list_sum:
        max_sum = list_sum
print(max_sum)
