task 1

import traceback


def opposite_house(address, n):
    i = 0
    street = []
    for i in range(2 * n):
        i += 1
        street.append(i)
    print(street)
    print(2 * n - street.index(address))
    return (2 * n - street.index(address))


# Тесты
try:
    assert opposite_house(1, 3) == 6
    assert opposite_house(3, 3) == 4
    assert opposite_house(2, 3) == 5
    assert opposite_house(3, 5) == 8
    assert opposite_house(7, 11) == 16
except AssertionError:
    print("TEST ERROR")
    traceback.print_exc()
else:
    print("TEST PASSED")