class Stack:
    def __init__(self):
        self.list = []
    def push(self,n):
        self.list = [n] + self.list
    def pop(self):
        return self.list.pop(0)

def isOp(string):
    list = ["+","-","/","*","^"]
    for x in list:
        if x==string: return True
    return False

def RPN(num):
    nums = Stack()
    ops = Stack()
    answer = ""
    for a in num:
        if isOp(a):
            ops.push(a)
        elif a == ')':
            answer = nums.pop()
            answer = nums.pop() + answer + ops.pop()
            nums.push(answer)
        elif a !='(':
            nums.push(a)
    return nums.pop()

def main():
    x = input()
    print(RPN(x))

if __name__=='__main__':
    main()