#!/usr/bin/env python3

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

def evaluate(line):
    stack = [0]
    num = 0
    op = ['+']
    for char in line:
        if char in '+*':
            stack[-1] = stack[-1]*num if op[-1] == '*' else stack[-1]+num
            op[-1] = char
            num = 0
        elif char == '(':
            stack.append(0)
            op.append('+')
        elif char == ')':
            stack[-1] = stack[-1]*num if op[-1] == '*' else stack[-1]+num
            num = stack.pop()
            op.pop()
        else:
            num = num*10 + int(char)
    stack[-1] = stack[-1]*num if op[-1] == '*' else stack[-1]+num
    return stack[0]


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