#include<stdio.h>
int main()
{
    int n, i;
    double sum=0.0, avg, ar[12][12];
    char ch1;
    scanf("%d ", &n);
    scanf("%c ", &ch1);
    for(i=0; i<12; i++){
        scanf("%lf", &ar[n][i]);
        sum = sum + ar[n][i];
    }
    if(ch1 == 'S'){
        printf("%.1lf\n",sum);
    }
    else
        if(ch1 == 'M'){
            printf("%.1lf\n",sum/12.0);
        }
    return 0;
}