def checkio(array: list) -> int:
    if array == []:
        return 0
    a = 0
    for i in array:
        if array.index(i) % 2 == 0:
            a = a + i
            print('Число {}, индекс {}'.format(i, array.index(i)))
    return a*array[-1]


print(checkio([-37, -36, -19, -99, 29, 20, 3, -7, -64, 84, 36, 62, 26, -76, 55, -24, 84, 49, -65, 41]))