Argument "42 32 22" isn't numeric in multiplication (*) at ./multigear.pl line 19, <STDIN> line 3.
Argument "11 13 15 17 19 21" isn't numeric in division (/) at ./multigear.pl line 19, <STDIN> line 3.
Use of uninitialized value in division (/) at ./multigear.pl line 20, <STDIN> line 3.
Illegal division by zero at ./multigear.pl line 20, <STDIN> line 3.