main()
int x,range,flag;
{
while(1)
{
flag=0;
if (scan(x,10) == 0)
    x=x+180;
 while(flag==0)
   {
range=scan(x,10);
if (range != 0)
    {
    if (range > 400)
	{ cannon(x,range);
	  drive(x,50);
	  x=x-20; }
	else
	  {
	   x=killit(x,range);
	   flag=1; } }
   else x=x-20;

}
}
}

killit(x,range)
int x,range;
   {
   while ((range != 0) && (range < 500))
   {
     x=improve(x);
     range=scan(x,10);
     if (range>40)
	cannon(x,range);
     if (range>100)
	drive(x-10,50);
   }
   return x; }

improve(x)
int x;
{
if (scan(x-5,5) != 0)
    x=x-5;
  else
    x=x+5;
if (scan(x-3,3) != 0)
    x=x-3;
  else
    x=x+3;
return x;
}