#include <cstdio>
int main()
{
    double a[12][12];
    int l;
    char t;
    scanf("%d\n%c", &l, &t);
    for (int i = 0; i < 12; i ++ )
        for (int j = 0; j < 12; j ++ )
            scanf("%lf", &a[i][j]);
    double s = 0;
    for (int i = 0; i < 12; i ++ ) s += a[l][i];
    if (t == 'S') printf("%.1lf\n", s);
    else printf("%.1lf\n", s / 12);
    return 0;
}