def summa(datas_nums):
    a=0
    for i in datas_nums:
        a+=int(i)
    return a
def multiply(datas_nums):
    a=1
    for i in datas_nums:
        a=a*int(i)
    return a

datas=str(input("write numbers: "))
datas_splitted=datas.split()

choice=str(input("+ or x"))

if choice =="+":
    print(summa(datas_splitted))
elif choice =="x":
    print(multiply(datas_splitted))
else:
    print("Error try again")