I3.1 If $a$ is the remainder when 2614303940317 is divided by 13 , find $a$.
$\begin{array}{l}2614303939000=13 \times 21100303000 \\ 2614303940317=13 \times 21100303000+1317=13 \times 21100303000+1313+4 \\ a=4\end{array}$