#include <iostream>
#include <cstdio>
using namespace std;
int main()
{
double m[12][12];
int l;
char c;
cin >> l >> c;
for (int i = 0; i < 12; i ++ )
for (int j = 0; j < 12; j ++ )
cin >> m[i][j];
double s = 0;
for (int j = 0; j < 12; j ++ )
s += m[l][j];
if (c == 'S') printf("%.1lf", s);
else printf("%.1lf", s / 12);
return 0;
}