text: # title
  
  title = "Smart Calc"
  print("Hello! I am a " + title)
  
  o = input('Enter operation: ')
  if o not in('+','-','*','/','//','%','**'):
      print('Error! Unknown operation!')
  else:
      a = int(input('a = '))
      b = int(input('b = '))
  
      if o == '+':
          print('a + b = ', a + b)
      elif o == '-':
          print('a - b = ', a - b)
      elif o == '*':
          print('a * b = ', a * b)
      elif o == '/':
          if b == 0:
              print('Error! Division by 0!')
          else:
              print('a / b = ', a / b)
      elif o == '//':
          if b == 0:
              print('Error! Division by 0!')
          else:
              print('a // b = ', a // b)
      elif o == '%':
          if b == 0:
              print('Error! Division by 0!')
          else:
              print('a % b = ', a % b)
      else: # o == '**'
          print('a ** b = ', a ** b)
  
  
  