#property copyright ""
#property link      ""

extern double START_BID = 86;
extern double STEP_WIDTH = 0.50;
extern double  LOTS = 0.01;
extern int     MAGIC = 1230;

int init()
{
   return(0);
}
int deinit()
{
   return(0);
}
int start()
{
   int i;
   int lots_num = 0;
   int order_num = OrdersTotal();
   
   for(i=0;i<100;i++){
      if(Bid > START_BID - i * STEP_WIDTH){
         lots_num = i;
         i = 100;
      }
   }
   
   if(order_num < lots_num){
      MovePosition(true);
   }else if(order_num > lots_num + 1){
      MovePosition(false);
   }
   return(0);
}
void MovePosition(bool dir)
{
   int i;
   
   if(dir == true){
      OrderSend(Symbol(),OP_BUY,LOTS,Ask,3, 0, 0,"",MAGIC,0,Blue);
   }else{
      for(i=0;i<OrdersTotal();i++)
      {
         OrderSelect(i, SELECT_BY_POS,MODE_TRADES);
         if(MAGIC == OrderMagicNumber())
         {
            OrderClose(OrderTicket(), OrderLots(), Bid, 3, Red);
            return;
         }
      }      
   }

}