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interface MyNumber
{
  public long getValue();
  public MyInteger Add(long a);
  public MyInteger Add(MyInteger a);  
  public MyInteger Minus(long a);
  public MyInteger Minus(MyInteger a);
  public MyInteger Multiply(long a);
  public MyInteger Multiply(MyInteger a);
  public MyInteger Divide(long a);
  public MyInteger Divide(MyInteger a);  
}

class MyInteger implements MyNumber
{
  private long n;
  MyInteger(long n){
    ...
  }
   ...
}