D:\>perl derp.pl
i: 1 - s: 1
i: 2 - s: 3
i: 3 - s: 6
i: 4 - s: 10
Argument "a" isn't numeric in addition (+) at derp.pl line 10.
i: a - s: 10
Argument "b" isn't numeric in addition (+) at derp.pl line 10.
i: b - s: 10
Argument "c" isn't numeric in addition (+) at derp.pl line 10.
i: c - s: 10
Argument "g" isn't numeric in addition (+) at derp.pl line 10.
i: g - s: 10
Argument "f" isn't numeric in addition (+) at derp.pl line 10.
i: f - s: 10
10