My girlfriend asked me for fortune telling.

Don't you understand the meaning of the third floor? It's simple. Find another street fortune teller in advance and give some money to tell some fortune-telling information in advance. Then arrange to see the fortune teller you found in advance on the way, and suggest that your girlfriend do the calculation again. I believe that if your girlfriend really cares about you, she will be willing to do the calculation again, and then the problem will be solved.