object Main {
  def main(args: Array[String]) {
    val sc = new java.util.Scanner(System.in)
    val n = sc.nextInt

    val s = Array.fill(n / 2)('1').mkString
    if (n % 2 == 0)
      println(s)
    else
      println("7" + s.drop(1))
  }
}