crystal, 118 bytes

Result

AC

Duration

1867ms

Code [DL]

i=-1;Y=`dd`.split;r,t,y,a,b,c,d,e,f,g,h,i=Y.map{|e|i+=1;e.to_i-Y[i%3].to_i};p (a*e*i+b*f*g+c*d*h-a*h*f-b*i*d-c*g*e)/6

stdin

89 87 85
87 83 01
51 42 23
03 16 60

stdout

14579

stderr

0+1 records in
0+1 records out
36 bytes copied, 0.000121644 s, 296 kB/s

strace