input: 
  class Sum:
      def __init__(self, x, y):
          self.x = x
          self.y = y
          
      def add(self):
          return self.x + self.y
      
  # Example usage:
  # s = Sum(3, 5)
  # print(s.add())  # Output: 8
  
output:     
      def subtract(self):
          return self.x - self.y
      
      def multiply(self):
          return self.x * self.y
      
      def divide(self):
          if self.y != 0:
              return self.x / self.y
          else:
              raise ValueError("Division by zero is not allowed")
  