local size = 20
local lp = LocalPlayer()

hook.Add("HUDShouldDraw", "Hide HUD", function (name)
    if name == "CHudHealth" then return false end
end)

hook.Add("HUDPaint", "Draw hearts", function ()
    surface.SetTexture(surface.GetTextureID("gui/silkicons/heart"))
    surface.SetDrawColor(255, 255, 255, 255)
    for i=1, lp:Health()/20 do
        local x = size
        if math.ceil(lp:Health()/20)==i then
            x = (lp:Health()-1)%20+1
        end
        surface.DrawTexturedRectUV(20+(i-1)*(size+10), ScrH() - 20 - size, x, size, size, size)
    end
end)