Need help

[plain tree]

game.Players.PlayerAdded:Connect(function(player)
    local leaderstats = Instance.new("Folder")
    leaderstats.Name = "leaderstats"
    leaderstats.Parent = player

    local strength = Instance.new("IntValue")
    strength.name = "Strength"
    strength.Parent = leaderstats

    while wait(1) do

        strength.Value = strength.Value + 1 

    end 
end)

try this