import java.util.Scanner;

public class Main
{
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while (scanner.hasNext())
        {
            int n = scanner.nextInt();
            StringBuffer sb = new StringBuffer();
            int mid = n * n;
            if (mid % 2 == 1)
            {
                int count = (n - 1) / 2;
                for (int i = count; i >= 0; i--)
                {
                    sb.append(mid - i * 2);
                    sb.append("+");
                }
                for (int i = 1; i < count; i++)
                {
                    sb.append(mid + i * 2);
                    sb.append("+");
                }
                sb.append(mid + count * 2);
            }
            else
            {
                int count = n / 2;
                for (int i = count - 1; i >= 0; i--)
                {
                    sb.append(mid - i * 2 - 1);
                    sb.append("+");
                }
                for (int i = 0; i < count - 1; i++)
                {
                    sb.append(mid + i * 2 + 1);
                    sb.append("+");
                }
                sb.append(mid + (count - 1) * 2 + 1);
            }
            System.out.println(String.valueOf(sb));
        }
    }
}