# test items
# anser = input("key a num,please!")
# print(type(anser)) # key in 12, will be stored as string form
# num = float(input()) # using float() can solve it
# print(num)

# try items
# item1
# firstname = "ke"
# lastname = "zj"
# print(firstname+lastname)
# item2
# firstname = input("hi,key your firstname")
# lastname = input("then, key your lastname")
# print("well i get it: ", firstname+lastname)

# item3
# border1 = float(input("how is the length?"))
# border2 = float(input("then, how is the width?"))
# totals = border1 * border2
#
# print("well i get it: ", totals, "pieces are enough!")

# item4
# border1 = float(input("how is the length?"))
# border2 = float(input("then, how is the width?"))
# price = float(input("well, how much is a piece?"))
# totals = border1 * border2 * price
#
# print("well it will cost: ", totals, "!")

# item5
# num_5 = int(input("how many 5fen do you have?"))
# num_2 = int(input("how many 2fen do you have?"))
# num_1 = int(input("how many 1fen do you have?"))
# print(num_5 * 5 + num_2 * 2 + num_1, "fen")