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