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



val () =
    let
        val n = readInt ()
       
        fun print_1 0 = ignore ()
          | print_1 x =
            (
              print "1";
              print_1 (x - 1)
            )

        fun printAns () =
            (
              if n mod 2 = 1 then print "7"
              else print "1";
              print_1 ((n div 2) - 1)
            )
    in
        (
          printAns ();
          print "\n"
        )
    end