include[HTML_REMOVED]
using namespace std;
char ch;
double a[13][13];
double sum = 0 ;
int main()
{
cin >> ch ;
for(int i=1;i<=12;i)
for(int j=1;j<=12;j)
cin >> a[i][j] ;
for(int i=1;i<=11;i)
for(int j=1;j<=12-i;j)
sum += a[i][j] ;
if(ch == ‘M’)
cout << fixed << setprecision(1) << sum / 66 ;
else
cout << fixed << setprecision(1) << sum ;
return 0;
}