Calculating a 15 day high - Newbie

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Could anybody tell me how to calculate a 15 day high. Do I use an array and then if-then-else-statements ? Like, If high[1]>high[0] then high[1] else ect.......

Thanks in advance for the answer.,

[Ray]

it = iHigh(Symbol(), PERIOD_D1, iHighest(Symbol(), PERIOD_D1, MODE_HIGH, 15, 0));