lines = list(map(lambda y: (y[0], int(y[1])), (x.strip().split() for x in open("input.txt"))))
length = len(lines)

for change_idx in range(length):
    old_value = lines[change_idx]
    if lines[change_idx][0] == 'nop':
        lines[change_idx] = ('jmp', lines[change_idx][1])
    elif lines[change_idx][0] == 'jmp':
        lines[change_idx] = ('nop', lines[change_idx][1])
    executed = set()
    pos = 0
    acc = 0
    while True:
        cmd, val = lines[pos]
        executed.add(pos)
        if cmd == 'nop':
            pos += 1
        elif cmd == 'acc':
            acc += val
            pos += 1
        elif cmd == 'jmp':
            pos += val
        if pos in executed:
            break
        if pos >= length:
            print('invalid index:', pos)
            print('changed index:', change_idx)
            print('current value:', acc)
            break
    lines[change_idx] = old_value