Those pesky animals

$\quad \quad P\quad E\quad N\quad G\quad U\quad I\quad N\\ +\quad S\quad E\quad A\quad G\quad U\quad L\quad L\\ +\quad \quad \quad \quad \quad \quad \quad \quad G\quad N\quad U\\ \overline { \quad \quad A\quad N\quad I\quad M\quad A\quad L\quad S }$

Assuming the above statement is true, and each letter represents a separate integer (positive, except for U = 0), find out the sum of the letters in $\overline { GLUE }$ .