my_array = [[1, 2, 2], [1, 3, 2], [1, 7, 2], [
    2, 4, 5], [2, 2, 3], [3, 6, 7], [3, 1, 2]]
print(my_array)
first_numbers = []

for item in my_array:
    first_numbers.append(item[0])
print(first_numbers)

set_of_first_numbers = set(first_numbers)
print(set_of_first_numbers)

unique_dict = {}

for item in set_of_first_numbers:
    unique_dict.setdefault(item, 0)

print(unique_dict)


for item in my_array:
    if item[0] in unique_dict.keys():
        unique_dict[item[0]] += item[1] + item[2]

print(unique_dict)