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