def add_v1(*matrices):
    m_sizes = [len(matrix) for matrix in matrices]
    v_sizes = [len(vectors) for matrix in matrices for vectors in matrix]
    same_values = lambda l: all(e == l[0] for e in l[1:])
    if not same_values(m_sizes) or not same_values(v_sizes):
        raise ValueError("Given matrices are not the same size.")
    return [[sum(elt) for elt in zip(*vectors)] for vectors in zip(*matrices)]


def add_v2(*matrices):
    get_shape = lambda matrix: [len(vector) for vector in matrix]
    shape = get_shape(matrices[0])
    if any(get_shape(matrix) != shape for matrix in matrices):
        raise ValueError("Given matrices are not the same size.")
    return [[sum(elt) for elt in zip(*vectors)] for vectors in zip(*matrices)]


def add_v3(*matrices):
    def get_shape(matrix):
        return [len(vector) for vector in matrix]

    shape = get_shape(matrices[0])
    if any(get_shape(matrix) != shape for matrix in matrices):
        raise ValueError("Given matrices are not the same size.")
    return [[sum(elt) for elt in zip(*vectors)] for vectors in zip(*matrices)]


add = add_v3