S = input()
operators = []
for s in S:
    if s in ["+","*"]:
        operators.append(s)
S = list(map(int,S.replace("+"," ").replace("*"," ").split()))
ans = S.pop(0)
for o in operators:
    if o == "+":
        ans *= S.pop(0)
    else:
        ans += S.pop(0)
print(ans)