# Some functions
def do_calc():
  input1 = int(input("Number 1> "))
  input2 = int(input("Number 2> "))


# BOT Presentation Shopping
print("Hi, I am Marvin, your personal bot.")
finished=False
input1=0
input2=0

#input to ask which opetarion you want to do
command = input("How can I help? ")

while finished==False:

  # if operation is add else substract
  if command == "add":
      print("lets add some numbers")
      do_calc()
      result = input1 + input2
      #operates with the input and print result
      print(input1," + " ,input2," = " ,result)
  elif command == "subtract":
      print("lets subtract some numbers")
      do_calc()
      #operates with the input and print result
      result = input1 - input2
      print(input1," - " ,input2," = " ,result)
  elif command == "multiply":
      print("lets subtract some numbers")
      do_calc()
      #operates with the input and print result
      result = input1 * input2
      print(input1," * " ,input2," = " ,result)
  elif command == "divide":
      print("lets subtract some numbers")
      do_calc()
      #operates with the input and print result
      result = input1 / input2
      print(input1," / " ,input2," = " ,result)
  elif command == "average":
    how_many = input("How many numbers> ")
    how_many = int(how_many)
    total = 0
    for number_count in range(how_many):
        number = input("Enter number " + str(number_count) + "> ")
        total = total + int(number)
    result = total / how_many
    print("the average = " + str(result))
  elif command=="discount":
    how_many = int(input("Which is the price > "))
    discount = int(input("Which is the discount > "))
    print ("The discount is ",discount/100*how_many," and the final prices is", how_many*(1-discount/100))
  elif command=="meal":
    print("Let's calculate the cost of meal")
    how_many = int(input("How many you are > "))
    discount = int(input("Which is the addition value > "))
    print ("The price per person is",discount/how_many )
  elif command=="bye":
    finished=True
  else:
      print("sorry I dont understand")
      #print polite error message in case nothing matchs