aoc

import fileinput
import re
from copy import deepcopy
from collections import namedtuple


class Instr(object):
    def __init__(self, op, arg):
        self.op = op
        self.arg = int(arg)

    def __repr__(self):
        return "{} {}".format(self.op, self.arg)


def run(P, ip, acc):
    cmd = P[ip]
    if cmd.op == "acc":
        acc += cmd.arg
        ip += 1
    elif cmd.op == "nop":
        ip += 1
    elif cmd.op == "jmp":
        ip += cmd.arg
    return (ip, acc)


P = list([Instr(*l.split()) for l in fileinput.input()])
ip = 0
acc = 0
seen = set()
while True:
    if ip in seen:
        print(acc)
        break
    seen.add(ip)
    ip, acc = run(P, ip, acc)

for change in range(len(P)):
    Pmod = deepcopy(P)
    if Pmod[change].op == "nop":
        Pmod[change].op = "jmp"
    elif Pmod[change].op == "jmp":
        Pmod[change].op = "nop"
    else:
        continue
    t = 0
    ip = 0
    acc = 0
    while 0 <= ip < len(Pmod) and t < 1000:
        t += 1
        ip, acc = run(Pmod, ip, acc)
    if ip == len(Pmod):
        print(acc)
        break