Installing MySql on debian 7.3

Hello, I debianom with the first day, I request assistance experienced, debian-amd64-7.3.0-i386-netinst
Want to install MySQL 5.1
apt-get install mysql-server mysql-client
But as it turned out aptitude search mysql-server mysql-client I was offered only install version 5.5 but I am not comfortable with
the command apt-get install mysql-server-5.1 no reaction has not been
climb up on the Internet I realized that I need to add a mirror
/etc/apt/sources.list which mirror I learned from here
then my sources.list file pointer
(click to show/hide)

where the 3 line down is what I added, and the penultimate zakomentiroval
then I rebutnulsâ and made the apt-get update
(click to show/hide)

then aptitude search update

then checked whether the coveted appeared, mysql 5.1
(click to show/hide)

There, too, and has done with mysql-client-5.1 he, too, there has already been

I thought this is it but when I wanted to install
apt-get install mysql-server-5.1 mysql-client-5.1
(click to show/hide)