3. Find all natural numbers $a, b, c$ satisfying the equations $a b c=80$, $(\mathrm{a}+1)(\mathrm{b}+1)(\mathrm{c}+1)=162$. In your answer, list all possible values of the number $a$ in ascending order separated by semicolons.
Answer: $2 ; 5 ; 8 \| 2,5,8$

#