S = input()

num = -1 
ns = []
ope = ""
for i in S:
    if i.isdigit():
        ns.append(i)
    else:
        if num != -1 and ope == "*":
            num = num + int("".join(ns))
        elif num != -1 and ope == "+":
            num = num * int("".join(ns))
        else:
            num = int("".join(ns))
        ns = []
        ope = i

if ope == "*":
    num = num + int("".join(ns))
elif ope == "+":
    num = num * int("".join(ns))

print(num)