rprogn, 273 bytes

Result

WA

Duration

468ms

Code [DL]

read "%d+" ↔ O "l" = O "k" = O "j" = [
read "%d+" ↔ O l - "c" = O k - "b" = O j - "a" = [
read "%d+" ↔ O l - "f" = O k - "e" = O j - "d" = [
read "%d+" ↔ O l - "i" = O k - "h" = O j - "g" = [
a e i * * b f g * * c d h * * + + a h f * * b i d * * c g e * * + + -6 //

stdin

83 39 21
04 09 89
92 33 35
77 93 71

stdout

11796
59268.0

stderr

strace