potential energy and energy conservation problem?

A car in an amusement park ride rolls without friction around the track it starts from rest at a point A from height H above the bottom of the loop. treat the car as a particle. what is the minimum value of height (in terms of R radius)such that the car doesn't fall off the very top of the ramp.

A walk through of how to this problem would be much appreciated I don't even know where to start!

thank you!

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