node, 145 bytes

Result

AC

Duration

1133ms

Code [DL]

[,,,a,b,c,d,e,f,g,h,i]=(""+require("fs").readFileSync(0)).split(/\s/).map((e,i,x)=>e-x[i%3]);console.log((a*e*i+b*f*g+c*d*h-a*f*h-b*d*i-c*e*g)/6)

stdin

10 77 89
21 31 89
14 04 45
36 29 81

stdout

5724

stderr

strace