#!/usr/bin/env python3

import functools
import sys
import typing

input_file = sys.argv[1]

with open(input_file) as fd:
    lines = [line.rstrip() for line in fd.readlines()]

gates: dict[str, tuple[str, typing.Callable, str]] = dict()
varis: dict[str, int] = dict()
funs = {
    "AND": int.__and__,
    "OR": int.__or__,
    "XOR": int.__xor__,
}

step = False
for line in lines:
    if not line:
        step = True
    elif step:
        a, op, b, _, dest = line.split()
        fun = funs[op]
        gates[dest] = (a, fun, b)
    else:
        dest, val = line.split(":")
        varis[dest] = int(val)


@functools.cache
def get_var(var: str) -> int:
    if var in varis:
        return varis[var]
    a, fun, b = gates[var]
    avar = get_var(a)
    bvar = get_var(b)
    return fun(avar, bvar)


zees = sorted([key for key in gates.keys() if key.startswith("z")])
bits = reversed([str(get_var(key)) for key in zees])
res = int("".join(bits), base=2)

print(res)