What number will this code output $87,83,72$ or $64?$

public class Question $\{$

public static int checksum$($String number$)\{$

int total $=0$;

boolean multiply $=$ false;

for $($int i $=0$; i $$ number.length$()$; i$++)\{$

int digit $=$ Integer.parseInt$(""+$ number.charAt$($i$))$;

if $($multiply$)\{$

digit $*=4$;

if $($digit $>15)\{$

digit $-=5$;

$\}$

$\}$

total $+=$ digit;

multiply $=!$multiply;

$\}$

return total;

$\}$

public static void main$($String$[]$ args$)\{$

System.out.println$($checksum$("9845312"))$;

$\}$

$\}$