What should be the integer number in $x($line $9)$ for the loop method to run at $1\mathrm{.}0Hz.$

void setup$()\{$

$//$ initialize digital pin LED$\_$BUILTIN as an output.

pinMode $($LED$\_$BUILTIN, OUTPUT$)$;

$\}$

void loop$()\{$

my$\_$function $(x)$;

$\}$

$//$ blink light for duration$\_$ms

void my$\_$function$($int duration$\_$ms$)\{$

digitalWrite$($LED$\_$BUILTIN, HIGH$)$ ;

delay$($duration$\_$ms$)$;

digitalWrite$($LED$\_$BUILTIN, LOW$)$ ;

delay$(50)$;

$\}$