#!/usr/bin/python3
from pprint import pprint

prog = []
with open("input") as fh:
    for ln in fh:
        op, arg = ln.split()
        prog.append((op, int(arg)))

class InfiniteLoopError(Exception):
    pass

def run(prog):
    acc = 0
    ip = 0
    seen = set()

    while True:
        if ip == len(prog):
            return acc
        if ip in seen:
            raise InfiniteLoopError(acc)
        seen.add(ip)
        op = prog[ip][0]
        arg = prog[ip][1]
        if op == "acc":
            acc += arg
            ip += 1
        elif op == "jmp":
            ip += arg
        elif op == "nop":
            ip += 1

def fixprog(prog):
    try:
        # first try original:
        acc = run(prog)
        print(acc)
    except InfiniteLoopError:
        print("infinite loop")
    for i in range(len(prog)):
        op = prog[i][0]
        if op not in ("jmp", "nop"):
            continue
        newop = "nop" if op == "jmp" else "jmp"
        fixedprog = list(prog)
        fixedprog[i] = (newop, prog[i][1])
        print("fixed", i, fixedprog[i])
        try:
            acc = run(fixedprog)
            print(acc)
        except InfiniteLoopError:
            print("infinite loop")

fixprog(prog)