int n = 3;
int m = 3;
int[,] mas = new int[n, m];
for (int i = 0; i < n; i++)
for (int j = 0; j < m; j++)
mas[i, j] = int.Parse(Console.ReadLine());
for (int i = 0; i < n; i++)
{
for (int j = 0; j < m; j++)
Console.Write(String.Format("{0,3}", mas[i, j]));
Console.WriteLine();
}