st: Add

[Tiago Fonseca <tiago.p.fonseca@gmail.com>]

How can I add a number to a real by its parity?
I have a 5 digits code and I want to generate 6 digits code where the 
last digit is:
0 if the 5 digits number end at 0 or a even number
5 if the 5 digits number end in a even number.

Regards,
Tiago Fonseca
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