Automatic shutdown batch file

@echo off
cls
:hour
set hour=
set /P hour=Enter how many hours until shutdown: %=%
echo hour = %hour%
:minute
set minute=
set /P minute=Enter how many minutes until shutdown: %=%
echo minute = %minute%
set /A realhour = hour * 60
set /A hoursANDminutes = realhour + minute
set /A total = hoursAndminutes * 60
echo Your computer will shut off in %total% seconds.
echo Starting the sleep process ...
sleep total
echo Computer is shutting down in:
echo 5
sleep 10
echo 4
sleep 10
echo 3
sleep 10
echo 2
sleep 10
echo 1
sleep 10
shutdown -s -t 00