i need lvling system that gives more health per lvl?

this is my script

game.Players.PlayerAdded:Connect(function(plr)

    local stats = Instance.new("IntValue",plr)
    stats.Name = "leaderstats"

    local Gold = Instance.new("IntValue",stats)
    Gold.Name = "Gold"
    Gold.Value = 0

    local XP = Instance.new("IntValue",stats)
    XP.Name = "XP"
    XP.Value = 0

    local lvl = Instance.new("IntValue",stats)
    lvl.Name = "lvl"
    lvl.Value = 0

        XP.Changed:connect(function()
        lvl.Value = math.floor(XP.Value/100)

    lvl.Changed:Connect(function()
        local char = Player.Character or Player.CharacterAdded:wait()
        local Humanoid = char:WaitForChild("Humanoid")
        Humanoid.MaxHealth = 100 + (lvl.Value * 10)
        Humanoid.Health = Humanoid.MaxHealth
    end)
end)

    end)