public static void Main()
int[, ] multiplicationtable = new int[13, 13];
for (int i = 0; i < 13; i++)
multiplicationtable[0, i] = i;
multiplicationtable[i, 0] = i;
for (int i = 1; i < 13; i++)
for (int j = 1; j < 13; j++)
multiplicationtable[i, j] = i * j;
for(int i=0; i<multiplicationtable.GetLength(0);i++)
{for(int j =0;j<multiplicationtable.GetLength(1);j++)
{Console.Write(multiplicationtable[i,j] + " ");}