#!/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]
MAP_CLOSE, MAP_PENALTY = dict(zip(OPEN, CLOSE)), dict(zip(OPEN, PENALTY))
for line in lines:
    success = True
    stack = []
    for char in line:
        if char in OPEN:
            stack.append(char)
        elif MAP_CLOSE[stack.pop()] != char:
            success = False
            break
    if success:
        cnt.append(reduce(lambda p, c: p*5 + MAP_PENALTY[c], stack[::-1], 0))

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