insect on the insect!!!!!!

A drinking straw of length \(1.5a \) and mass \(2m\) is placed on a square table of side \(a\) parallel to one of its sides such that one third of its length extends beyond the table. An insect of mass \(\frac{m}{2}\) lands on the inner end of the straw (ie, the end which lies on the table) and walks along the straw until it reaches the outer end. It does not topple even when another insect lands on top of the first one. Find the largest mass of the second insect that can have without toppling the straw. Neglect friction. Take \(m =0.02kg\) \(a =1m\)