Points $A_1, A_2,\ldots, A_n$ are found on a circle in this order. Each point $A_i$ has exactly $i$ coins. A move consists in taking two coins from two points (may be the same point) and moving them to adjacent points (one move clockwise and another counter-clockwise). Find all possible values of $n$ for which it is possible after a finite number of moves  to obtain a configuration with each point $A_i$ having $n+1-i$ coins.
1. **Define the initial and target configurations:**
   - Initially, each point \( A_i \) has exactly \( i \) coins.
   - We want to reach a configuration where each point \( A_i \) has \( n+1-i \) coins.

2. **Define the sum \( S \):**
   - Let \( S = A_1 - A_2 + A_3 - A_4 + \ldots + A_{n-1} - A_n \).

3. **Calculate the initial value of \( S \):**
   - Initially, \( A_i = i \) for all \( i \).
   - Therefore, \( S_{\text{initial}} = 1 - 2 + 3 - 4 + \ldots + (n-1) - n \).
   - This is an arithmetic series with alternating signs. For \( n \) even, we can pair the terms:
     \[
     S_{\text{initial}} = (1 - 2) + (3 - 4) + \ldots + (n-1 - n) = -1 - 1 - \ldots - 1 = -\frac{n}{2}.
     \]
   - Let \( n = 2k \). Then \( S_{\text{initial}} = -k \).

4. **Calculate the target value of \( S \):**
   - In the target configuration, \( A_i = n+1-i \).
   - Therefore, \( S_{\text{target}} = (n+1-1) - (n+1-2) + (n+1-3) - \ldots + (n+1-(n-1)) - (n+1-n) \).
   - Simplifying, we get:
     \[
     S_{\text{target}} = n - (n-1) + (n-2) - (n-3) + \ldots + 2 - 1.
     \]
   - This is also an arithmetic series with alternating signs. For \( n \) even, we can pair the terms:
     \[
     S_{\text{target}} = (n - (n-1)) + ((n-2) - (n-3)) + \ldots + (2 - 1) = 1 + 1 + \ldots + 1 = \frac{n}{2}.
     \]
   - Let \( n = 2k \). Then \( S_{\text{target}} = k \).

5. **Analyze the change in \( S \) during a move:**
   - A move consists of taking two coins from two points and moving them to adjacent points.
   - This move changes \( S \) by \(\pm 4\) because each move affects two adjacent points, and the net effect on \( S \) is an increase or decrease by 4.

6. **Determine the feasibility of reaching the target configuration:**
   - Initially, \( S = -k \).
   - We want to reach \( S = k \).
   - The change in \( S \) must be a multiple of 4.
   - Therefore, \( k - (-k) = 2k \) must be a multiple of 4.
   - This implies \( 2k \equiv 0 \pmod{4} \), or \( k \equiv 0 \pmod{2} \).
   - Hence, \( k \) must be even.

7. **Conclusion:**
   - For \( n = 2k \) with \( k \) even, it is possible to reach the target configuration.
   - For \( n = 2k \) with \( k \) odd, it is not possible to reach the target configuration.

The final answer is \( \boxed{ n = 4m } \) for any integer \( m \).