I count over 1000 with my fingers

My fingers:
left hand
1 - thumb
2 - pointer
4 - middle
8 - ring
16 - pinky

right hand
32 - thumb
64 - pointer
128 - middle
256 - ring
512 - pinky

Counting up to 16 ... go:

1. thumb
2. index
3. thumb, index
4. middle
5. middle, thumb
6. middle, index
7. middle, index, thumb
8. ring
9. ring, thumb
10. ring, index
11. ring, index, thumb
12. ring, middle
13. ring, middle, thumb
14. ring, middle, index
15. ring, middle, index, thumb
16. little

$lthumb = false;
$lpoint = false;
$lmiddle = false;
$lring = false;
$lpinky = false;
$rthumb = false;
$rpoint = false;
$rmiddle = false;
$rring = false;
$rpinky = false;
$i = 0;
for ($rpinky == false; $rpinky <> true; ){
  for ($rring == false; $rring <> true; ){
    for ($rmiddle == false; $rmiddle <> true; ){
      for ($rpoint == false; $rpoint <> true; ){
        for ($rthumb == false; $rthumb <> true; ){
          for ($lpinky == false; $lpinky <> true; ){
            for ($lring == false; $lring <> true; ){
              for ($lmiddle == false; $lmiddle <> true; ){
                for ($lpoint == false; $lpoint <> true; ){
                  for ($lthumb == false; $lthumb <> true; ){
           $lthumb=true;
     i+=1;
     echo 'Left Thumb ' && i ;
      }
         $lpoint=true;
       }
       $lmiddle=true;
     }
     $lring=true;
      }
         $lpinky=true;
    }
       $rthumb=true;
  }
     $rpoint=true;
      }
   $rmiddle=true;
    }
 $rring=true;
  }
  $rpinky=true;
}