set /p q= for /f "tokens=1-12 delims=%q:~8,1% " %%a in ("%q%") do ( set /a d-=a set /a e-=b set /a f-=c set /a g-=a set /a h-=b set /a i-=c set /a j-=a set /a k-=b set /a l-=c set /a v="(d*h*l+e*i*j+f*g*k-d*k*i-e*l*g-f*j*h)/6" echo %v% )