Very Simple Problem

This morning, the jury decided to add one more problem (Very Simple Problem) to the Olympiad. The executive secretary of the Organizing Committee published its condition in a single copy, and now he needs to make $n$ more copies before the start of the Olympiad. He has two copy machines: the first can make a copy of one paper in $x$ seconds, and the second can make a copy in $y$ seconds. You may use either one copy machine or both simultaneously. You can make a copy not only from the original, but also from any copy.

Help him determine the minimum time required to make $n$ copies.