makeatletter
 setbeamertemplate{frametitle}{%
    nointerlineskip%
    vskip-beamer@headheight%
    vbox to beamer@headheight{%
        vfil
        leftskip=-beamer@leftmargin%
        advanceleftskip by0.3cm%
        rightskip=-beamer@rightmargin%
        advancerightskip by0.3cm plus1fil%
        {usebeamercolor[fg]{frametitle}
            usebeamerfont{frametitle}
            ifbeamer@noframenumbering%
            insertframetitlepar% added number
            else
            insertframetitlehfillinsertframenumberpar% added number
            fi}
        {usebeamercolor[fg]{framesubtitle}
            usebeamerfont{framesubtitle}insertframesubtitlepar}%
        vbox{}%
        vskip-1em%
        vfil
    }%
 }
 makeatother