A Web music store offers two versions of a popular song. The size of the standard version is $2\mathrm{.}8$ megabytes $($MB$).$ The size of the high$-$quality version is $4\mathrm{.}6MB$ Yesterday, the high$-$quality version was downloaded three times as often as the standard version. The total size downloaded for the two versions was $4814MB$ How many downloads of the standard version were there?