```cpp

include[HTML_REMOVED]

include[HTML_REMOVED]

using namespace std;
double a[12][12];
int main(){

char ch;
double sum;
cin>>ch;
for(int i=0;i<12;i++){
    for(int j=0;j<12;j++){
        cin>>a[i][j];
    }
}
for(int i=0;i<5;i++){
    for(int j=1+i;j<11-i;j++){
        sum+=a[i][j];

    }   
    }
    if(ch=='S') printf("%.1lf",sum);
    else if(ch=='M') printf("%.1lf",sum/30);
    return 0;

}