Exercise 1. Calculate

$$
\frac{1 \times 2 \times 4 + 2 \times 4 \times 8 + 3 \times 6 \times 12 + 4 \times 8 \times 16}{1 \times 3 \times 9 + 2 \times 6 \times 18 + 3 \times 9 \times 27 + 4 \times 12 \times 36}
$$

Only a numerical answer is expected here. The answer should be given as an irreducible fraction (i.e., in the form $\frac{a}{b}$ where $a$ and $b$ are integers with no common divisors).