How do you make it so that the player's max health is increased each time he levels up?

How do you make it so that the player's max health is increased each time he levels up? Thanks!

local leaderstats = Instance.new("IntValue")
local lv = Instance.new("IntValue",leaderstats)
local exp = Instance.new("IntValue",leaderstats)
local levelUp = {32, 64, 128, 256, 512, 1024, 2048}

game.Players.PlayerAdded:connect(function(Player)
    lv.Name = "Lv"
    lv.Value = 1
    exp.Name = "EXP"
    exp.Value = 0
    leaderstats.Parent = Player
    leaderstats.Name = "leaderstats"
    exp.Changed:connect(function()
        if exp.Value >= levelUp[lv.Value]then
            exp.Value = exp.Value - levelUp[lv.Value]
            lv.Value = lv.Value + 1
            Player.Character.Humanoid.MaxHealth = Player.Character.MaxHealth + 100 -- I tried this
        end
    end)
end)