sample BF code to put 50 in slot 0
+         add 1 to slot 0
>         move to slot 1
+++++++   add 7 to slot 1
[         while slot 1 is not 0
  <         move to slot 0
  +++++++   add 7 to slot 0
  >         move to slot 1
  -         subtract 1 from slot 1
]
<         move back to slot 0