from collections import deque


def main():
    S = input()
    tmp = ""
    queue_ = deque()
    for letter in S:
        match letter:
            case "*":
                queue_.append(int(tmp))
                queue_.append("+")
                tmp = ""
            case "+":
                queue_.append(int(tmp))
                queue_.append("*")
                tmp = ""
            case other:
                tmp += other

    queue_.append(int(tmp))

    while len(queue_) > 1:
        first = queue_.popleft()
        op = queue_.popleft()
        second = queue_.popleft()
        match op:
            case "*":
                queue_.appendleft(first*second)
            case "+":
                queue_.appendleft(first+second)
    print(queue_[0])


if __name__ == "__main__":
    main()