@echo off
 
set /p line=""
for /f "tokens=1-3 delims= " %%1 in ("%line%") do (
	set /a j=%%1
	set /a k=%%2
	set /a l=%%3
	)
set /p line=""
for /f "tokens=1-3 delims= " %%1 in ("%line%") do (
	set /a a=%%1 - %j%
	set /a b=%%2 - %k%
	set /a c=%%3 - %l%
)
set /p line=""
for /f "tokens=1-3 delims= " %%1 in ("%line%") do (
	set /a d=%%1 - %j%
	set /a e=%%2 - %k%
	set /a f=%%3 - %l%
)
set /p line=""
for /f "tokens=1-3 delims= " %%1 in ("%line%") do (
	set /a g=%%1 - %j%
	set /a h=%%2 - %k%
	set /a i=%%3 - %l%
)
set /a v=(%a%*%e%*%i%+%b%*%f%*%g%+%c%*%d%*%h%-%a%*%h%*%f%-%b%*%i%*%d%-%c%*%g%*%e%)/6
echo %v%