$m$ boys and $n$ girls ($m>n$) sat across a round table, supervised by a teacher, and they did a game, which went like this. At first, the teacher pointed a boy to start the game. The chosen boy put a coin on the table. Then, consecutively in a clockwise order, everyone did his turn. If the next person is a boy, he will put a coin to the existing pile of coins. If the next person is a girl, she will take a coin from the existing pile of coins. If there is no coin on the table, the game ends. Notice that depending on the chosen boy, the game could end early, or it could go for a full turn. If the teacher wants the game to go for at least a full turn, how many possible boys could be chosen?

[i]Hendrata Dharmawan, Boston, USA[/i]
1. **Identify the condition for the game to end early:**
   - The game ends early if a girl is immediately to the right of the starting boy. This is because the girl will take the coin placed by the boy, and if there are no coins left, the game ends.

2. **Identify the condition for the game to go for at least a full turn:**
   - For the game to go for at least a full turn, the starting boy must not have a girl immediately to his right. This ensures that the coin placed by the boy will not be immediately taken by a girl, allowing the game to continue.

3. **Analyze the seating arrangement:**
   - Since there are \(m\) boys and \(n\) girls, and \(m > n\), we can consider the seating arrangement around the round table.
   - We need to find the number of boys who do not have a girl immediately to their right.

4. **Pairing boys and girls:**
   - Consider the pairs of a boy and the girl immediately to his right. If we remove such pairs from the circle, we are left with fewer boys and girls.
   - Each pair consists of one boy and one girl. Since there are \(n\) girls, we can form \(n\) such pairs.

5. **Remove the pairs:**
   - After removing \(n\) pairs (each consisting of one boy and one girl), we are left with \(m - n\) boys.
   - These remaining \(m - n\) boys do not have any girls immediately to their right, as all girls have been paired and removed.

6. **Conclusion:**
   - The remaining \(m - n\) boys can be chosen as the starting boy to ensure the game goes for at least a full turn.

The final answer is \(\boxed{m - n}\)