include [HTML_REMOVED]
int main()
{
char operation;
double matrix[12][12];
double result = 0;
int count = 0;
scanf("%c", &operation);
for (int i = 0; i < 12; i++)
{
for (int j = 0; j < 12; j++)
{
scanf("%lf", &matrix[i][j]);
}
}
for (int i = 0; i < 12; i++)
{
for (int j = 0; j < 12; j++)
{
if (j < 11 - i)
{
result += matrix[i][j];
count++;
}
}
}
if (operation == 'M')
{
result /= count;
}
printf("%.1f\n", result);
return 0;
}