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I think the answer for this question was 80.. but I'm not sure
Try to plug in 80 to N, so you can check if your answer is correct:-)  
It's the right answer :) Don't worry... You did great ☺ also if not sure, check... try to substitute, 80-23=57 so that m-23 < 58 :D
I mean n-23
The answer is 80 or if possible, 80.999