Whitespace, 0

I couldn't resist. (S= space, T= tab, N = newline), all have ASCII codes <= 32.

SSSSNSSSSNTTSSSSSTNTNTTNSSSNSSSSTNTTTNTSTNSSSSTNSSSSTNTTTSSSSTNTSSTTTSSSSSTSNTNTTSSSSTSNTTTNTTSNSSSSNSSSSTSNTTTSSSSNTTTTSSSTTSNSNSNNSSTNSSSSNTTTTNSTSSSSTSTSNTNSSNNN 

Base64 encoded for easy copy & paste.

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