import java.util.Scanner

object Main {
  def main(args: Array[String]) {
    val result = solve(new Scanner(System.in))
    if (result.length > 0) println(result)
  }

  def solve(in: String): String = solve(new Scanner(in))

  def solve(sc: Scanner): String = {
    var N = sc.nextInt

    while (N.toString.distinct.length != 1) {
      N += 1
    }
    N.toString
  }
}
