#include <iostream>

using namespace std;

int n, ans;
string s;
int main(){
  cin >> n;
  for(int i = 0; i < n; i++){
    cin >> s;
    if(s == "Tetrahedron")
      ans += 4;
    else if(s == "Cube")
      ans += 6;
    else if(s == "Icosahedron")
      ans += 20;
    else if(s == "Dodecahedron")
      ans += 12;
    else if(s == "Octahedron")
      ans += 8;
  }
  cout << ans;
  return 0;
}