numbers = range(0, 16)

numbers[1] = 0;

i = 2

while i < (len(numbers) - 1):
    if numbers[i] == 0:
        i = i + 1
        continue

    num = numbers[i]

    while num < numbers[len(numbers)-1]:
        num = num + num
        if num > len(numbers) - 1:
            break

        numbers[num] = 0

    i = i + 1

print numbers