$a =(Read-Host).Split(" ")
$b =(Read-Host).Split(" ")
$c =(Read-Host).Split(" ")
$d =(Read-Host).Split(" ")

foreach($i in 0..3){
$b[$i]-=$a$[i]
$c[$i]-=$a$[i]
$d[$i]-=$a$[i]
}
echo(($b[0]*$c[1]*$d[2]+$b[1]*$c[2]*$d[0]+$b[2]*$c[0]*$d[1]-$b[1]*$c[0]*$d[2]-$b[0]*$c[2]*$d[1]-$b[2]*$c[1]*$d[0])/6)