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