#include <iostream>
#include <cstdio>

using namespace std;

int main()
{
    int n;
    cin >> n;
    char t;
    cin >> t;

    double x[12][12];
    for(int i = 0; i < 12; i++)
        for (int j = 0; j < 12; j++)
            cin >> x[i][j];

    double sum = 0;
    for(int i = 0; i < 12; i++) sum += x[i][n];

    if(t == 'M') sum /= 12;
    printf("%.1lf", sum);

    return 0;
}