Here is Code:

$/*$ They won't crack this one.$$ No one learns arithmetic anymore... $*/$

$$ input $=$ read$\_$line$(0,$ NULL$)$;

$$ k $=$ sscanf$($input$,"\%$d $\%$d $\%$d $\%$d$",$ &a$,$ &b$,$ &c$,$ &d$)$;

$$ status $=$ bombphase$\_3($k$,$ a$,$ b$,$ c$,$ d$)$;

$$ if $($status $<0)$ exit $(1)$;$/*$ The bomb exploded.$$ I beat them! $*/$

$$ phase$\_$defused$($status$)$;

$$ if $($status $>0)$ printf $("$Your bomb defusing skills are great!

$")$;

$$ printf$("$Halfway there!

$")$;

Dump of assembler code for function bombphase$\_3$:

$0$x$0000000000401538<+0>$: sub$$ $$0$x$8,\%$rsp

$0$x$000000000040153$c $<+4>$: cmp$$ $$0$x$4,\%$rdi

$0$x$0000000000401540<+8>$: jne$0$x$401565$

$0$x$0000000000401542<+10>$: add$$ $$0$x$9$b$,\%$rsi

$0$x$0000000000401549<+17>$: sub$\%$rsi,$\%$rcx

$0$x$000000000040154$c $<+20>$: xor$$ $$0$xfffffffffffffe$95,\%$rcx

$0$x$0000000000401553<+27>$: cmp$$ $$0$xffffffffffffff$78,\%$rcx

$0$x$000000000040155$a $<+34>$: sete $\%$al

$0$x$000000000040155$d $<+37>$: movzbl $\%$al$,\%$eax

$0$x$0000000000401560<+40>$: cmp$\%$r$8,\%$rcx

$0$x$0000000000401563<+43>$: je $0$x$401571$

$0$x$0000000000401565<+45>$: callq$0$x$401$e$6$f

$0$x$000000000040156$a $<+50>$: mov$$ $$0$xffffffffb$31769$c$2,\%$rax

$0$x$0000000000401571<+57>$: add$$ $$0$x$8,\%$rsp

$0$x$0000000000401575<+61>$: retq$$

End of assembler dump.