l18 localscript

local player = game.Players.LocalPlayer
local button = player.PlayerGui:WaitForChild("ScreenGui").Center.PetInventory.Upgrade
local napis = button.Parent.DamageLabel
local oldBackground = button.BackgroundColor3

button.MouseButton1Click:Connect(function ()
    local damage = player.Values.Damage.Value
    local cost = 10*(2^(damage-1))
    if player.leaderstats.Shards.Value >= cost then
     damage +=1
     game.ReplicatedStorage.Remotes.Upgrade:FireServer(cost, damage)
     button.Text = "Purchased!"
     button.BackgroundColor3=Color3.new(0.0352941, 0.52549, 0.00392157)
     napis.Text = "Your dmg multiplier: x" .. damage
     wait(2)
     cost = 10*(2^(damage-1))
     button.Text = "Upgrade for " .. cost .. " Shards"
     button.BackgroundColor3=oldBackground
    else
     button.Text = "Not enough Shards!"
     button.BackgroundColor3=Color3.new(0.52549, 0.0156863, 0.0862745)
     wait(2)
     button.Text = "Upgrade for " .. cost .. " Shards"
     button.BackgroundColor3=oldBackground
    end
end)