#!/usr/bin/python3
import re

mem = []
with open("input") as fh:
    for ln in fh:
        if m := re.match(r"mask = ([01X]{36})", ln):
            mask = m.group(1)
            mask_and = int(mask.replace("1", "0").replace("X", "1"), base=2)
            mask_or  = int(mask.replace("X", "0"), base=2)
        elif m:= re.match(r"mem\[(\d+)\] = (\d+)", ln):
            i = int(m.group(1))
            v = int(m.group(2))
            while i >= len(mem):
                mem.append(0)
            mem[i] = (v & mask_and) | mask_or
        else:
            raise RuntimeError(ln)
print(sum(mem))