#include<stdio.h>
#define R 12
#define C 12
int main()
{
    int row,i,j;
    double a[R][C],sum = 0.0,ave;
    char ch;
    scanf("%d",&row);
    scanf(" %c",&ch);
    for ( i = 0; i < R; i++)
        for( j = 0; j < C; j++)
            scanf("%lf",&a[i][j]);
        if(ch == 'S'){
        for( j = 0; j < R; j++)
            sum += a[row][j];
        printf("%.1f",sum);
    } 
        if (ch =='M'){
            for( j = 0; j < R; j++)
                sum += a[row][j];
            ave = 1.0 * sum / C;
            printf("%.1f",ave);
        }
    return 0;    
}