range for 1 notrump rebid on overcall

I am south.

east deals , bids 1 club.

I overcall 1 heart.

west passes.

Partner north bids 1 spade (we play new suit forcing by unpassed hand)

east passes.

Now as south I rebid 1 notrump.



How many high card points am I supposed to be showing?



(1 notrump overcall direct I play 15 to 18 hcp)

range for 1 notrump rebid on overcall