csharp, 291 bytes

Result

AC

Duration

852ms

Code [DL]

using System;using System.Linq;class A{static void Main(){char[]c={' ','\n'};int[]a=Console.In.ReadToEnd().Split(c).Take(12).Select(Int32.Parse).ToArray();for(int z=9;z-->0;)a[z]-=a[9+z%3];Console.Write((a[7]*(a[0]*a[5]-a[3]*a[2])+a[6]*(a[4]*a[2]-a[1]*a[5])+a[8]*(a[3]*a[1]-a[0]*a[4]))/6);}}

stdin

03 74 11
91 60 75
09 14 46
98 88 33

stdout

27699

stderr

strace