When should I jump over the cell in this mission: https://py.checkio.org/ru/mission/signpost/ ???

As you can see on the example (blue square right) 1 to 2 - jump over cell with 7, and 2 to 3 to 4 - also, but from 4 to 5 - does not jump over cell, so, when should I jump and when not jumping? Thank you a lot.