#include <iostream>
#include<string>
#include<cstdio>
using namespace std;
double m[13][13];
int s;
string ch;
double sum=0;
int main()
{
cin >> s>>ch;
for (int i = 0; i < 12; i ++ )
for (int j = 0; j < 12; j ++ )
cin >> m[i][j];
for (int i = 0; i < 12; i ++ )
sum+=m[i][s];
if(ch=="S") cout << sum<<endl;
else printf("%.1lf",sum/12);
return 0;
}