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**Summary::**Find the voltage in an OP-amp circuit with current source

I(in) = 1 uA.

What I'm confused about is if there is any voltage flowing through R1. Because if there was and let's say it went downwards, then where would it go, I mean it cannot just disappear. And if it goes upwards, then it has to go to the right through R3 (right?). But then we have I(in)+I(out) = I(in) and that does not make sense that more current can just appear out of nowhere.

So my guess is that the current passes like the picture below. But then how would I calculate U(ut). I can of course calculate the voltage between R2 and R3, but the problem then is that I suppose there isn't flowing any current through R1, so I cannot really use Ohms law?

https://www.physicsforums.com/attachments/299760