1 Ampere flows into the web at the very top. 1 Ampere flows out of the web at the very bottom.
There is a node at the very center of the web. It has 3 arrows pointing into it and 3 arrows pointing out of it. The arrows point in the assumed current directions. If a current flows opposite to its assumed direction, then it will have a negative value. Add all the inward arrows values and call the sum P. Add all the outward arrows and call the sum N. What is the value of P-N?
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Kirchhoff's current law states the total current at a node is 0. That is the answer.