I've been studying circuits lately and I have a difficulty when applying Kirchhoff's rules. My question has to do with how can I find how many currents are in a circuit. I know about junctions etc and how it splits. But for example, when you have 2 or 3 batteries how many currents are there and which current runs through each resistor? I've been trying to practice online and I came across this circuit:
And I don't understand why there are 3 currents when there are 4 batteries. Can anyone help me please?