def checkio(array):
    return sum([x for i, x in enumerate(array) if i % 2 == 0]) * array[-1:][0] if len(array) > 0 else 0


# These "asserts" using only for self-checking and not necessary for auto-testing
if __name__ == '__main__':
    print('Example:')
    print(checkio([0, 1, 2, 3, 4, 5]))

    assert checkio([0, 1, 2, 3, 4, 5]) == 30, "(0+2+4)*5=30"
    assert checkio([1, 3, 5]) == 30, "(1+5)*5=30"
    assert checkio([6]) == 36, "(6)*6=36"
    assert checkio([]) == 0, "An empty array = 0"
    print("Coding complete? Click 'Check' to review your tests and earn cool rewards!")