Turn off your computer automatically without any software

For doing this at first open the run command, then write the following command is run shutdown.exe -s -t 300 

I write 300 in this command because I want to turn off my computer after 5 minutes,and in 5 minutes there is 300 seconds.Suppose we want to turn off your computer after 30 minutes then you have to write 

 shutdown.exe -s -t 800  in run.Then press enter.