#算数の宿題

S = input()

num = S.split("*")
sum = 0

for t in num:
    if t.isdecimal():
        sum += int(t)
    else:
        num_b = t.split("+")
        sum += int(num_b.pop(0))
        for d in num_b:
            sum *= int(d)

print(sum)