MetaTrader 4 code for the Gann Hexagon

Hello
Would someone be good enough to write the MetaTrader 4 code or the Gann Hexagon Formula below
I do not know how to write the Square root and Power Functions MetaTrader 4 code
All of the brackets are necessary for precedence in the formula in MetaStock

Hoping that you can oblige
Thank you in advance
Derek
=================== Code =======================================
Pivot:=Highest(HIGH); {VISIBLE ON THE CHART}
Decrement:=Input("Enter Decrement"1.5,12.5,2.5);
RING :=( Square root (9 + 12* Pivot))+3)/6;
PLOT HORIZONTAL LINE AT LEVEL :=(Power((((RING -Decrement)*6) -3),2) -9)/12;
===============================================================

The attached PNG Screen Shot is just to show how the Gann Hexagon is Calculated
I only wish to Plot a Single Horizontal Line on a MT4 Chart for the the Value From Gann Hexagon Formula
I am not trying to Plot (Display) the Full Gann Hexagon on a Metatreder 4 Chart

you can go directly to MetaTrader site and find much work on Gann technical analysis methods