#include<bits/stdc++.h>
    using namespace std;
    int main()
    {
       int a,sum = 0;
       string s;
       cin>>a;
       for(int i=1;i<=a;i++)
       {
           cin>>s;
           if(s=="Tetrahedron") sum+=4;
           else if(s=="Cube") sum+=6;
           else if(s=="Octahedron") sum+=8;
           else if(s=="Dodecahedron") sum+=12;
           else if(s=="Icosahedron") sum+=20;
       }
       cout<<sum<<endl;

    }