#include <cstdio>
#include <iostream>
using namespace std;
int main()
{
    int c;
    char t;
    double q[12][12];
    cin >> c >> t;
    for (int i = 0; i < 12; i ++ )
        for (int j = 0; j < 12; j ++ )
            cin >> q[i][j];
    double s = 0;
    for (int i = 0; i < 12; i ++ ) s += q[i][c];
    if (t == 'S') printf("%.1lf\n", s);
    else printf("%.1lf\n", s / 12);
    return 0;
}