How to Upgrade LinuxMint 14.1 to 15 in Terminal

So i am trying to upgrade from Linux Mint 14, to Linux Mint 15, by following these steps.
1.) sudo sed -i 's/quantal/raring/' /etc/apt/sources.list
2.) sudo sed -i 's/nadia/olivia/' /etc/apt/sources.list
3.) sudo apt-get update && sudo apt-get dist-upgrade
4.) sudo apt-get upgrade
5.) When ask, Keep new config files. Press Yes for all three.

a: Configuration file `/etc/issue'
b: Configuration file `/etc/issue.net'
c: Configuration file `/etc/lsb-release'
6.) Restart your system