Let $S$ be a finite set of real numbers such that given any three distinct elements $x,y,z\in\mathbb{S}$, at least one of $x+y$, $x+z$, or $y+z$ is also contained in $S$. Find the largest possible number of elements that $S$ could have.
1. **Understanding the Problem:**
   We need to find the largest possible number of elements in a finite set \( S \) of real numbers such that for any three distinct elements \( x, y, z \in S \), at least one of \( x+y \), \( x+z \), or \( y+z \) is also in \( S \).

2. **Initial Claim:**
   We claim that the largest possible number of elements in \( S \) is 7, and a possible set is \( \{-3, -2, -1, 0, 1, 2, 3\} \).

3. **Verification of the Claim:**
   Let's verify that the set \( S = \{-3, -2, -1, 0, 1, 2, 3\} \) satisfies the given condition. We need to check that for any three distinct elements \( x, y, z \in S \), at least one of \( x+y \), \( x+z \), or \( y+z \) is also in \( S \).

   - Consider any three distinct elements \( x, y, z \) from \( S \).
   - If one of these elements is 0, say \( x = 0 \), then \( x+y = y \) and \( x+z = z \), both of which are in \( S \).
   - If none of the elements is 0, we need to check the sums of pairs of elements from \( \{-3, -2, -1, 1, 2, 3\} \).

4. **Checking Non-zero Elements:**
   - For \( \{-3, -2, -1\} \):
     - \( -3 + (-2) = -5 \) (not in \( S \))
     - \( -3 + (-1) = -4 \) (not in \( S \))
     - \( -2 + (-1) = -3 \) (in \( S \))
   - For \( \{1, 2, 3\} \):
     - \( 1 + 2 = 3 \) (in \( S \))
     - \( 1 + 3 = 4 \) (not in \( S \))
     - \( 2 + 3 = 5 \) (not in \( S \))

   We see that in both cases, at least one of the sums is in \( S \).

5. **Maximality Argument:**
   - Suppose \( S \) has more than 7 elements. Consider adding another element \( a \) to \( S \). We need to ensure that for any three distinct elements \( x, y, a \in S \), at least one of \( x+a \), \( y+a \), or \( x+y \) is in \( S \).
   - Adding any element outside the range \([-3, 3]\) will likely violate the condition, as the sums involving this new element may not be in \( S \).

6. **Conclusion:**
   - The set \( S = \{-3, -2, -1, 0, 1, 2, 3\} \) satisfies the given condition.
   - Any larger set will not satisfy the condition, as shown by the argument above.

The final answer is \( \boxed{7} \)