CapitalInicial = 100000;

SetOption("ExtraColumnsLocation",1);
SetOption("InitialEquity", CapitalInicial );
SetOption("MaxOpenPositions", 1);

PositionSize = CapitalInicial;
BuyPrice=SellPrice=O;

Dia = Optimize("Dia",12,0,21,1);
Duracion = Optimize("Duracion",11,1,42-Dia,1);

DiaX = Month()== 12 AND Month() != Ref(Month(),-1);

Buy = Ref(DiaX,-Dia);
Sell = BarsSince(Buy)==Duracion;