```cpp

include[HTML_REMOVED]

include[HTML_REMOVED]

using namespace std;
double a[12][12];
int main(){
double sum;
char ch;
cin>>ch;
for(int i=0;i<12;i){
for(int j=0;j<12;j){
cin>>a[i][j];
}
}
for(int i=1;i<6;i){
for(int j=0;j<i;j){
sum+=a[i][j];
}
}
for(int i=6;i<11;i){//此后是倒三角，要分开循环输出
for(int j=0;j<11-i;j){
sum+=a[i][j];
}
}
if(ch==’S’) printf(“%.1lf”,sum);
else if(ch==’M’) printf(“%.1lf”,sum/30);
return 0;
}