Akon goes to the bookstore every $$4$$ days. Ben goes to the bookstore every $$7$$ days. Cris goes to the bookstore every $$8$$ days. They met each other today at the bookstore. What is the least number of days it will take all three of them to meet again at the bookstore?~\uline{~~~~~~~~~~}~days 
Overseas Competition->Knowledge Point->Calculation Modules