#include<iostream>
using namespace std;
int main(void)
{
char ch=getchar();
double ans=0.0;
for(int i=1;i<=12;++i)
for(int j=1;j<=12;++j)
{
double x;
cin>>x;
if(i>=8&&j>=6-(i-8)&&j<=7+(i-8))
ans+=x;
}
if(ch=='S')
printf("%.1f\n",ans);
else
printf("%.1f\n",ans/30.0);
return 0;
}