with open("8.txt") as f:
    ins = []
    for line in f:
        ins.append(line.strip())

def term(ins):
    f = set()
    f2 = set()
    acc = 0
    ip = 0
    while True:
        if ip >= len(ins):
            break
        i = ins[ip]
        if ip in f:
            if ip in f2:
                return None
            f2.add(ip)
        f.add(ip)
        # print(ip, i)
        c, v = i.split(" ")
        v = int(v)
        if c == "acc":
            acc += v
        elif c == "jmp":
            ip = ip + v - 1
        ip += 1
    return acc

for i in range(len(ins)):
    l = ins[i]
    if not (l.startswith("jmp") or l.startswith("nop")): continue
    orig = l
    if l.startswith("jmp"):
        new = l.replace("jmp", "nop")
    elif l.startswith("nop"):
        new = l.replace("nop", "jmp")
    ins[i] = new
    r = term(ins)
    if r is None:
        ins[i] = orig
    else:
        print(r)
        break