#include <iostream>
#include <cstdio>

using namespace std;

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

    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 j = 0; j < 12; j++) 
    {
        sum += x[n][j];
       // cout << "sum = " << sum << endl;
    }
    if(c == 'M') sum /= 12.0;

    printf("%.1lf", sum);

    return 0;
}