node, 162 bytes

Result

AC

Duration

583ms

Code [DL]

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

stdin

65 43 05
77 80 75
15 85 31
02 29 84

stdout

60658

stderr

strace