Function A($)
Dim $c, $t

	For $c=0 to 15-($<4)
		$A = 0 + right($, 1)
		$t = $A + 1.1*$A*(1&$c) + $t
		$ = left($,~)
		If $t mod 10 + $ | 4&$A + 5
			$A = 0
Endfunction