calculate a discount for my basket 2

print("Hi, I am Marvin, your personal bot.")
command = input("How can I help? ")
if command == "calculate a discount for my basket":
    shopping = []
    R1 = input ( "How many items are in your basket ? ")
    save = 0
    for item_number in range(int(R1)):
        item = input ( "What is the item " + str(item_number+1) + "  you wish to buy ? " )
        shopping.append(item)
        cost1= input ( "What is the list price of the  "  + item + "  you wish to buy today ? " )
        cost_off = input( " What is the percentage discount for  the " + item + "? " )
        save = save + int(cost1)*(int(cost_off)/100)



print ( "You will save  " + str(save) + " RMB. " )