using System;

public class Test
{
	public static void Main()
	{
	int n = 5;
int[,] matrix = new int[n, n];
int curr = 1;
for (int diff = 1 - n; diff <= n - 1; diff++)
{
    for (int i = 0; i < n; i++)
    {
        int j = i - diff;
                   
        if (j < 0 || j >= n)
            continue;
        if (((diff+n+1)&1) > 0)    
          matrix[i, n-1-j] = curr++;
        else
          matrix[n-1-j, i] = curr++;
    }
}
for (int j = 0; j < n; j++)
{
    for (int i = 0; i < n; i++)
        Console.Write(matrix[j, i] + "  " );
    Console.WriteLine();
}
	}
}