There are $$80$$ blue balls, $$40$$ red balls, and $$30$$ white balls of identical size in a bag. Now let\textquotesingle s pick balls without observing them. To make sure we get $$29$$ balls of one color, $$28$$ balls of another color, and $$10$$ balls of the last color, how many balls should we pick at least? 
Overseas Competition->Knowledge Point->Combinatorics->Pigeonhole Principle->Worst Case in Pigeonhole Principle Problems