#include<iostream>
#include<cstdio>

using namespace std;

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

    char a;
    cin >> a;

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

    double sum = 0;
    for(int i = 0;i < 12;i ++)
        sum += m[i][c];

    if(a == 'S') printf("%.1lf\n",sum);
    if(a == 'M') printf("%.1lf\n",sum / 12);

    return 0;
}