fun readInt () =
    valOf (TextIO.scanStream (Int.scan StringCvt.DEC) TextIO.stdIn)

val () =
    let
        val n = readInt ()
        val a_s = List.tabulate (n, fn _ => readInt ())
        val ans = foldl (fn (acc, x) => acc + x) 0 a_s
    in
        print (Int.toString ans)
    end