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I can call ToString on each and parse them back to an int but that doesn't seem right at all. Is there a special function to do math against outputs and inputs?

I think you can do something similar to this:
```Output.Tuple&lt;?, int&gt;(args.VmTemplate, args.SrvExtendSize).Apply(t =&gt; {
   var (template, extendedSize) = t;
   return template.Disks[0].Size + args.SrvExtendSize;
});```
that will take both inputs and make sure that both are counted in/awaited if needed before converting them into a single output.

Ah that seems to work.
```Size = Output.Tuple(args.VmTemplate, args.SrvExtendSize).Apply(t =&gt; {
    var (template, extendedSize) = t;
    return template.Disks[0].Size + extendedSize;
}),```
It just seems like a lot of work to just add two ints.