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