#!/usr/bin/env python3
from functools import reduce

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

cnt = []
OPEN, CLOSE, PENALTY = "([{<", ")]}>", [1, 2, 3, 4]
for line in lines:
    try:
        stack = []
        for char in line:
            try:
                stack.append(OPEN.index(char))
            except ValueError:
                if CLOSE[stack.pop()] != char:
                    raise ValueError("Char not found: " + char)
        cnt.append(reduce(lambda p, c: p*5 + PENALTY[c], stack[::-1], 0))
    except ValueError:
        pass

cnt.sort()
print(cnt[len(cnt) // 2])