$3.$ The office of a company has $10$ cabinets, $20$ desks and $15$ shelves that must be sorted out within two weeks. The company hired temporary work$-$study students to clean them. Assuming that the work$-$study students are strong, they can sort out up to $2$ items a day. Cabinets, $4$ desks and $5$ shelves, the salary is $800$ yuan per day. Also know that working$-$study students can only work part$-$time for a maximum of $4$ days in these two weeks. The work$-$study students are slightly less capable. They can organize up to $1$ cupboard, $4$ desks and $3$ shelves every day. Their salary is $450$ yuan per day. Under the most cost$-$saving conditions, how many days should the company hire two work$-$study students respectively? $?$