#include <iostream>

using namespace std;

int main()
{
    double a[12][12], sum = 0;
    char c;
    cin >> c;
    for(int i = 0; i <12; i ++)
    {
        for (int j = 11; j >=0; j --)
        {   
            cin >> a[i][j];
            if(i<j)
                sum = sum + a[i][j];
        }
    }
    if(c =='S') printf("%.1lf",sum);
    else printf("%.1lf",sum/66.0);

    return 0;
}