What is sum of the values of $a,b,$ and $c$ after the following code statements? $($assume that $x$ already had an integer value assigned$)$

int $a=5$

int $b=2$

int $c=7$

int $d=a+b+c$

$a=d-b-1$

$b=d-c-1$

$c=d-a-1$