13.169. A crystal, while in the formation stage, uniformly increases its mass. Observing the formation of two crystals, it was noted that the first one over 3 months gave the same mass increase as the second one over 7 months. However, after a year, it turned out that the first crystal increased its initial mass by $4 \%$, and the second - by $5 \%$. Find the ratio of the initial masses of these crystals.