let odai N =
    seq {for i in 1..N ->
         if i % 15 = 0 then 4 elif i % 3 = 0 || i % 5 = 0 then 2 else 0} |>
    Seq.sum

let doIt () =
    let N = stdin.ReadLine () |> int
    odai N |> printfn "%d"