public class IntSequence {

  private int[] sequence;

  public IntSequence(params int[] elements){
    sequence = new int[elements.Length];
    for(int i = 0; i < elements.Length; i++){
      sequence[i] = elements[i];
    }
  }

  public int? Min(){
    int theMinimum;
    if (sequence.Length == 0)
      return null;
    else {
      theMinimum = sequence[0];
      foreach(int e in sequence)    
        if (e < theMinimum)
           theMinimum = e;
    }
    return theMinimum;
  }

  public int? Max(){
    int theMaximum;
    if (sequence.Length == 0)
      return null;
    else {
      theMaximum = sequence[0];
      foreach(int e in sequence)    
        if (e > theMaximum)
           theMaximum = e;
    }
    return theMaximum;
  }

  // Other useful sequence methods

}