Find the smallest positive integer $n$ for which one can select $n$ distinct real numbers such that each of them is equal to the sum of some two other selected numbers.

[i]Proposed by Anton Trygub[/i]
To find the smallest positive integer \( n \) for which one can select \( n \) distinct real numbers such that each of them is equal to the sum of some two other selected numbers, we will proceed as follows:

1. **Understanding the Problem:**
   We need to find the smallest \( n \) such that there exist \( n \) distinct real numbers \( a_1, a_2, \ldots, a_n \) where each \( a_i \) can be expressed as \( a_i = a_j + a_k \) for some \( j, k \) with \( j \neq k \).

2. **Graph Representation:**
   Consider a graph where each vertex represents one of the \( n \) numbers. Draw an edge between vertices \( a_i \) and \( a_j \) if \( a_i = a_j + a_k \) for some \( k \). By the handshake lemma, the graph has \( n \) edges.

3. **Checking Small Values of \( n \):**
   - For \( n = 3 \): Suppose \( a_1, a_2, a_3 \) are the numbers. We need \( a_1 = a_2 + a_3 \), \( a_2 = a_1 + a_3 \), and \( a_3 = a_1 + a_2 \). This leads to a contradiction because it implies \( a_1 = a_2 = a_3 = 0 \), which is not allowed since the numbers must be distinct.
   - For \( n = 4 \): Suppose \( a_1, a_2, a_3, a_4 \) are the numbers. We need to form a cycle where each number is the sum of two others. However, it is not possible to form such a cycle without repeating numbers or violating the distinctness condition.
   - For \( n = 5 \): Suppose \( a_1, a_2, a_3, a_4, a_5 \) are the numbers. Similar to \( n = 4 \), it is not possible to form a cycle without repeating numbers or violating the distinctness condition.

4. **Constructing a Valid Set for \( n = 6 \):**
   Let us consider the numbers \( a_1 = 1, a_2 = 5, a_3 = 4, a_4 = -1, a_5 = -5, a_6 = -4 \). We can check if each number can be expressed as the sum of two others:
   - \( a_1 = 1 = 5 + (-4) = a_2 + a_6 \)
   - \( a_2 = 5 = 1 + 4 = a_1 + a_3 \)
   - \( a_3 = 4 = 5 + (-1) = a_2 + a_4 \)
   - \( a_4 = -1 = 4 + (-5) = a_3 + a_5 \)
   - \( a_5 = -5 = -1 + (-4) = a_4 + a_6 \)
   - \( a_6 = -4 = 1 + (-5) = a_1 + a_5 \)

   Each number is indeed the sum of two others, and all numbers are distinct.

5. **Conclusion:**
   Since \( n = 6 \) works and smaller values of \( n \) do not, the smallest positive integer \( n \) for which one can select \( n \) distinct real numbers such that each of them is equal to the sum of some two other selected numbers is \( n = 6 \).

The final answer is \( \boxed{6} \).