#!/usr/bin/env python3
import re

lines = (x.strip().replace(" ", "") for x in open("input.txt"))


def calc(a, b, pop):
    return a+b if pop == "+" else a*b


def pres(pop):
    if pop == "+":
        return 2
    if pop == "*":
        return 1
    return 0


def evaluate(line):
    stack = []
    postfix = [0]
    pos = -1
    for char in "("+line+")":
        pos += 1
        if char == '(':
            stack.append("(")
        elif char == ')':
            while True:
                pop = stack.pop()
                if pop == '(':
                    break
                a, b = postfix.pop(), postfix.pop()
                postfix.append(calc(a, b, pop))
        elif char in "0123456789":
            postfix[-1] = postfix[-1] * 10 + int(char)
        elif char in "*+":
            while True:
                pop = stack.pop()
                if pres(pop) <= pres(char):
                    stack.append(pop)
                    stack.append(char)
                    postfix.append(0)
                    break
                a, b = postfix.pop(), postfix.pop()
                postfix.append(calc(a, b, pop))
        else:
            raise SystemError("Invalid char: "+char)
    return postfix[0]


print(sum(evaluate(line) for line in lines))