I have a pot of wine and I brought Youchun. When I met the store, I doubled. I drank a bucket when I met a friend. I went to three places and there was no wine in the pot. May I ask how much wine is in this pot?

Suppose we have a drink at the store (just like when we meet flowers), the first store 1, the second store 2 (double the number of shops we meet), the third store 4 (double the number of shops we meet), and the third store 7 * *, plus three times when we meet flowers (fixed at 1), a * * is 65438+.