set /p line= set /a j=%line:~0,2% set /a k=%line:~3,2% set /a l=%line:~6,2% set /a a=%line:~9,2% set /a b=%line:~12,2% set /a c=%line:~15,2% set /a d=%line:~18,2% set /a e=%line:~21,2% set /a f=%line:~24,2% set /a g=%line:~27,2% set /a v=(%a%*%e%*%i%+%b%*%f%*%g%+%c%*%d%*%h%-%a%*%h%*%f%-%b%*%i%*%d%-%c%*%g%*%e%)/6 echo %v%