## Task $5 / 69$

Given is a parallelogram with the perimeter $u=30$ units, whose angles are all not less than $60^{\circ}$. In this parallelogram, an equilateral triangle is inscribed such that one side of the triangle coincides with the parallelogram side $A B=a$, and the opposite vertex of the triangle lies on the opposite side of the parallelogram.

How large are the parallelogram sides $a$ and $b$, if their measures are integers?