printfn "%d" (System.IO.File.ReadAllText("CSVnumbers.csv")
              |> (new System.Text.RegularExpressions.Regex(@"((?<=,)(.+)(?=\n|\r\n|\r|\z))")).Matches
              |> Seq.cast<System.Text.RegularExpressions.Match>
              |> Seq.sumBy(fun x -> int x.Value))