3. (10 points) $A = \{5,6,7,8\}$、$B = \{u,v\}$、$C = \{\}$

consider $a = |\text{Power Set}(A)|$

$b = |A \times B|$（$\times$ is cross product）

$c = |\text{Power Set}(C)|$

Please calculate $2^c + b + a$.