A well is 11 meters deep. At the bottom of the well, a frog wants to climb up. It can climb up to 3.45 meters during the day, but slides down 1.25 meters at night. Calculated in this way, how many days can I climb up?
一口井深11米，井底一只青蛙要爬上来，它白天向上能爬3.45米，但晚上却向下滑1.25米．照这样来算，第几天才能爬上来？
<result>5</result>