#!/bin/python

def check(code):
    visited = [False for _ in range(len(code) + 1)]
    acc = 0
    pointer = 0;
    
    while not visited[pointer]:
        instr = code[pointer].split(" ")

        visited[pointer] = True

        if instr[0] == "acc":
            acc += int(instr[1])
            pointer += 1
        elif instr[0] == "nop":
            pointer += 1
        elif instr[0] == "jmp":
            pointer += int(instr[1])
        
        if pointer >= len(code):
            return acc

    return None

with open("input", 'r') as input:
    code = [line.strip() for line in input.readlines()]
    candidates = []
    for idx, instr in enumerate(code):
        parts = instr.split(" ")
        if parts[0] == "acc":
            continue

        value = int(parts[1])
        if parts[0] == "nop" and ((value < 2 and value > -2) or (idx + value) > len(code) + 1):
            continue

        candidates.append(idx)


    print(len(candidates))
    for candidate in candidates:
        new_code = list(code)
        if new_code[candidate].startswith("nop"):
            new_code[candidate] = new_code[candidate].replace("nop", "jmp")
        else:
            new_code[candidate] = new_code[candidate].replace("jmp", "nop")

        print(f"Checking candidate {candidate}...")

        result = check(new_code)
        if result:
            print(f"Found candidate with acc: {result}")
            break

    # visited = [False for _ in range(len(code) + 1)]
    # acc = 0
    # pointer = 0;
    
    # while not visited[pointer]:
        # instr = code[pointer].split(" ")

        # visited[pointer] = True

        # if instr[0] == "acc":
            # acc += int(instr[1])
            # pointer += 1
        # elif instr[0] == "nop":
            # pointer += 1
        # elif instr[0] == "jmp":
            # pointer += int(instr[1])
        
    # print(acc)