import re

lines = (x.strip() for x in open("input.txt"))
mem = {}
regex_mask = re.compile(r"mask = (.+)")
regex_mem = re.compile(r"mem\[(.+)] = (.+)")
mask = ""


def combination(res, sum=0):
    if len(res) == 0:
        yield sum
    else:
        head, tail = res[0], res[1:]
        if head != 'X':
            yield from combination(tail, sum=sum*2+int(head))
        else:
            yield from combination(tail, sum=sum*2)
            yield from combination(tail, sum=sum*2+1)


for line in lines:
    match = regex_mask.match(line)
    if match is not None:
        mask = match.group(1)
    else:
        match = regex_mem.match(line)
        addr, dec = list(map(int, match.groups()))
        bin = format(addr, '036b')
        res = [(a if b == '0' else b) for a, b in zip(bin, mask)]
        for x in combination(res):
            mem[x] = dec

print(sum(mem.values()))