Scarecrow Robot
A farmer employs a scarecrow robot to protect his cornfield. The robot follows a path around the plantation, passing through stations circled. Each day, the robot starts at station 1 and follows a series of commands that move it to neighboring stations, both clockwise (1) and counterclockwise (-1).
Given also a number of control station, which is under monitoring, calculate how many times the robot visits the station during a day.
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