#include <iostream>
#include <cmath>
#include <algorithm>
#include <vector>
#include <string>
#include <set>

using namespace std;

int main () {
    int n, ans = 0;
    cin >> n;

    while (n--) {
        string s;
        cin >> s;

        switch (s[0]) {
            case 'T':
                ans += 4;
                break;
            case 'C':
                ans += 6;
                break;

            case 'O':
                ans += 8;
                break;

            case 'D':
                ans += 12;
                break;
            case 'I':
                ans += 20;
                break;
        }
    }

    cout << ans << endl;

}