input: Write a function to create a Python class called `Calculator` with two methods to add two numbers and three numbers respectively. The first method should be named `add_two_numbers` and the second method should be named `add`. The class should have an initializer method `__init__` that does nothing. 
  
  
  class Calculator:
      def __init__(self):
          pass
      
      def add_two_numbers(self, a, b):
          return a + b
  
      def add(self, a, b, c):
          return a + b + c
  
  calculator = Calculator()
  result1 = calculator.add_two_numbers(1, 2)
  print(result1)  # Expected output: 3
  result2 = calculator.add(1, 2, 3)
  print(result2)  # Expected output: 6
  
output: class Calculator:
      def __init__(self):
          pass
      
      def add_two_numbers(self, a, b):
          return a + b
  
      def add(self, a, b, c):
          return a + b + c