let n = stdin.ReadLine() |> int

let a =
    stdin.ReadLine().Split()
    |> Array.map int

let revA = Array.rev a

let x = a.[0] + revA.[0]

let mutable flg = true

for i = 0 to n - 1 do
    if a.[i] + revA.[i] <> x then
        flg <- false

if flg then
    "Yes"
else
    "No"
|> printfn "%s"