cmd, 247 bytes

Result

AC

Duration

2568ms

Code [DL]

set /P s=
set /a "(g=%s:~18,2%-(a=%s:~0,2%))&(h=%s:~21,2%-(b=%s:~3,2%))&(i=%s:~24,2%-(c=%s:~6,2%))&(j=%s:~27,2%-a)&(k=%s:~30,2%-b)&(l=%s:~33,2%-c)&(w=(%s:~12,2%-b)*(i*j-g*l))&(x=(%s:~15,2%-c)*(g*k-h*j))&(y=(w+x+(%s:~9,2%-a)*(h*l-i*k))/6)"
echo %y%

stdin

12 76 34
56 38 87
12 20 76
44 06 84

stdout

8344

stderr

wine: created the configuration directory '/root/.wine'
Wine cannot find the FreeType font library.  To enable Wine to
use TrueType fonts please install a version of FreeType greater than
or equal to 2.0.5.
http://www.freetype.org
Wine cannot find the FreeType font library.  To enable Wine to
use TrueType fonts please install a version of FreeType greater than
or equal to 2.0.5.
http://www.freetype.org
Wine cannot find the FreeType font library.  To enable Wine to
use TrueType fonts please install a version of FreeType greater than
or equal to 2.0.5.
http://www.freetype.org
Wine cannot find the FreeType font library.  To enable Wine to
use TrueType fonts please install a version of FreeType greater than
or equal to 2.0.5.
http://www.freetype.org
err:ole:marshal_object couldn't get IPSFactory buffer for interface {00000131-0000-0000-c000-000000000046}
err:ole:marshal_object couldn't get IPSFactory buffer for interface {6d5140c1-7436-11ce-8034-00aa006009fa}
err:ole:StdMarshalImpl_MarshalInterface Failed to create ifstub, hres=0x80004002
err:ole:CoMarshalInterface Failed to marshal the interface {6d5140c1-7436-11ce-8034-00aa006009fa}, 80004002
err:ole:get_local_server_stream Failed: 80004002
err:winediag:nulldrv_CreateWindow Application tried to create a window, but no driver could be loaded.
err:winediag:nulldrv_CreateWindow Make sure that your X server is running and that $DISPLAY is set correctly.
err:winediag:nulldrv_CreateWindow Application tried to create a window, but no driver could be loaded.
err:winediag:nulldrv_CreateWindow Make sure that your X server is running and that $DISPLAY is set correctly.
err:ole:apartment_createwindowifneeded CreateWindow failed with error 0
err:ole:apartment_createwindowifneeded CreateWindow failed with error 0
err:ole:marshal_object couldn't get IPSFactory buffer for interface {00000131-0000-0000-c000-000000000046}
err:ole:apartment_createwindowifneeded CreateWindow failed with error 14007
err:ole:StdMarshalImpl_MarshalInterface Failed to create ifstub, hres=0x800736b7
err:ole:CoMarshalInterface Failed to marshal the interface {6d5140c1-7436-11ce-8034-00aa006009fa}, 800736b7
err:ole:get_local_server_stream Failed: 800736b7
err:winediag:nulldrv_CreateWindow Application tried to create a window, but no driver could be loaded.
err:winediag:nulldrv_CreateWindow Make sure that your X server is running and that $DISPLAY is set correctly.
Wine cannot find the FreeType font library.  To enable Wine to
use TrueType fonts please install a version of FreeType greater than
or equal to 2.0.5.
http://www.freetype.org
err:winediag:nulldrv_CreateWindow Application tried to create a window, but no driver could be loaded.
err:winediag:nulldrv_CreateWindow Make sure that your X server is running and that $DISPLAY is set correctly.
err:module:import_dll Loading library urlmon.dll (which is needed by L"C:\\windows\\system32\\mshtml.dll") failed (error c000007b).
Wine cannot find the FreeType font library.  To enable Wine to
use TrueType fonts please install a version of FreeType greater than
or equal to 2.0.5.
http://www.freetype.org
wine: configuration in '/root/.wine' has been updated.
Wine cannot find the FreeType font library.  To enable Wine to
use TrueType fonts please install a version of FreeType greater than
or equal to 2.0.5.
http://www.freetype.org

strace