$M$ is an integer set with a finite number of elements. Among any three elements of this set, it is always possible to choose two such that the sum of these two numbers is an element of $M.$ How many elements can $M$ have at most?
1. **Define the set \( M \) and the condition:**
   Let \( M \) be a finite set of integers such that for any three elements \( a, b, c \in M \), there exist two elements among them whose sum is also in \( M \).

2. **Assume \( M \) has more than 7 elements:**
   Suppose \( M \) has more than 7 elements. We will show that this leads to a contradiction.

3. **Consider the largest positive elements:**
   Assume \( M \) contains at least 4 positive elements. Let these elements be \( a > b > c > d > 0 \).

4. **Check the condition for the largest elements:**
   - Consider the triplet \( (a, b, c) \). According to the problem's condition, there must be two elements among \( a, b, c \) whose sum is in \( M \).
   - The possible sums are \( a+b, a+c, \) and \( b+c \). Since \( a, b, c \) are the largest elements, \( a+b, a+c, \) and \( b+c \) are all greater than \( a \), which means they cannot be in \( M \) because \( a \) is the largest element in \( M \).

5. **Contradiction for positive elements:**
   This contradiction shows that \( M \) cannot have more than 3 positive elements.

6. **Consider the largest negative elements:**
   Similarly, assume \( M \) contains at least 4 negative elements. Let these elements be \( -a < -b < -c < -d < 0 \).

7. **Check the condition for the largest negative elements:**
   - Consider the triplet \( (-a, -b, -c) \). According to the problem's condition, there must be two elements among \( -a, -b, -c \) whose sum is in \( M \).
   - The possible sums are \( -a + (-b), -a + (-c), \) and \( -b + (-c) \). Since \( -a, -b, -c \) are the largest negative elements, \( -a + (-b), -a + (-c), \) and \( -b + (-c) \) are all less than \( -a \), which means they cannot be in \( M \) because \( -a \) is the largest negative element in \( M \).

8. **Contradiction for negative elements:**
   This contradiction shows that \( M \) cannot have more than 3 negative elements.

9. **Include zero:**
   Since \( M \) can have at most 3 positive elements and at most 3 negative elements, and it can include 0, the maximum number of elements in \( M \) is \( 3 + 3 + 1 = 7 \).

10. **Example of a set with 7 elements:**
    The set \( M = \{-3, -2, -1, 0, 1, 2, 3\} \) satisfies the condition. For any three elements, it is always possible to choose two such that their sum is also in \( M \).

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