import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        final Scanner scanner = new Scanner(System.in);
        //题目说将n定义为小朋友的数量,这里为了方便代码阅读将变量n重命名为amountOfCls,译为小朋友的数量
        int amountOfCls = scanner.nextInt(), minimum = scanner.nextInt(), maximum = scanner.nextInt(), maximumReward = 0;
        for (int i = minimum; i <= maximum; i++) {
            int result = i % amountOfCls;
            if (result <= maximumReward) continue;
            maximumReward = result;
        }
        System.out.println(maximumReward);
    }
}

signed main()
{
cin >> n >> l >> r;
if( l / n == r / n )
{
cout << r % n << endl;
}
else
{
cout << n - 1 << endl;
}
return 0;
}