+1 tbh. All you people saying, 'How can you be that dumb?!' (whilst, I assume, masturbating furiously at your own smug intellect), it obviously isn't that simple, some people aren't that good at maths and would go through it step by step.
And with my basic understanding of maths, shouldn't it be 40+(40x0)+1 or something to get 41 as the answer?