How to find LTP of next option strike price

I have executed a Buying leg in Bank nifty (say Leg 1). I am trying to check the LTP of the next strike price of the Buying leg (say Leg2) and compare it with the LTP of the executed buying leg. If the difference is < 15 Rs , then I will check the next leg (say leg 3).
If Leg3 - leg 2 <=15 , then I like next leg of Leg 3 (say leg 4)…an like that.Then I buy the last leg , where the difference is <= 15 Rs.
How to do that ?
This is same like reverse buying strategy…

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