main()
{
  int i,range,links,rechts,count,step;

  count=0; step=10; i:=rechts=0; links=360;
  while(1)
    {if (count=3) {i=links; rechts=links; links=links+40; step=10;}
     count=0;
     while (count<3)
       { ++count;
         while (i<=links && i>=rechts)
           {range=scan(i,step-1);
             if (range>0)
               {links=i+20;
                rechts=i-20;
                if (range>700) drive(i,50);
                         else {drive(i,0);
                               if (step=1) cannon(i,range);
                              }
                step=1;
               }
             else i=i+step;
           }
       }
    }
}