Darn, I thought the answer was 7. Math was never a strong point. Coming from a man whose maths teacher taught 2+2=5. I know what this means, btw, my first sentence was a joke, and the third refers to the initial question...
Sorry for any insult taken for the sarcasm, but I have been around NTs who do not appreciate my humour at all.
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"Think like the whelp, think like the whelp, think like the whelp... " Captain Jack Sparrow
"Hello. My name is Inigo Montoya. You killed my father. Prepare to die." Inigo Montoya