divide the cost of a meal in a restaurant V1

print("Hi, I am Marvin, your personal bot.")
command = input("How can I help? ")
if command == "divide the cost of a meal in a restaurant":
    food = []
    R1 = input ( "How many items are in a meal in a restaurant ? ")
    i =0
    j = 0
    k =0
    for item_number in range(int(R1)):
        item = input ( "What is the item " + str(item_number+1) + "  in a meal in a restaurant ? " )
        food.append(item)
        cost1= input ( "What is the list price of the  "  + item + "  in restaurant ? " )
        cost_R = input( " What is the price of the " + item + " in market?  " )
        i = i + int(cost1)
        j = j + int(cost_R)
k = (j / i) *100

print ( "the food if I go to buy myself in the market is " + str(k) + "% I spent in a restaurant that night." )