import javabooklet.*;

class Max {
  public static void main(String args[]) {
    double x;
    double max = Double.NEGATIVE_INFINITY;
    while(true) {
      x = OptionIO.getDouble("Immetti un reale");
      if(OptionIO.isCanceled()) break;
      if(x > max) max = x;
    }
    System.out.println("il massimo e' " + max);
  }
}