The lamb, deer and bear built a small pool together. The lamb drinks water from the pool every 2 days, the deer drinks water from the pool every 3 days, and the bear drinks water from the pool every 4 days. How many times did they go to the pool to drink water on the same day in a month?
小羊、小鹿和小熊共同修了一个小水池，小羊每2天到池边喝一次水，小鹿每3天到池边喝一次水，小熊每4天到池边喝一次水，从第一天开始它们一个月内有几次是同一天到池边喝水的？
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