input: def IntList():
      """Design a data structure in Python to store integer values.
      
      >>> int_list = IntList()
      >>> int_list.add_value(10)
      >>> int_list.add_value(5)
      >>> int_list.add_value(20)
      >>> int_list.find_min()
      5
      >>> int_list2 = IntList()
      >>> int_list2.add_value(100)
      >>> int_list2.add_value(50)
      >>> int_list2.find_min()
      50
      """
      class IntList:
          def __init__(self):
              self.values = []
          
          def add_value(self, value):
              self.values.append(value)
          
          def find_min(self):
              return min(self.values)
output:     return IntList