S = input()
l = list(map(int,S.split("*+")))
op = ["+"]
for s in S:
    if s == "*" or s == "+":
        op.append(s)
ans = 0
for i in range(len(op)):
    t = l[i]
    p = op[i]
    if p == "+":
        ans += t
    else:
        ans *= t
print(ans)