#include <iostream>
using namespace std;
int n;
int main(){
cin >> n;
string s;
int res=0;
for (int i = 1; i <= n; i++){
cin >> s;
if (s[0]=='T') res += 4;
if (s[0]=='C') res+=6;
if (s[0]=='O') res+=8;
if (s[0]=='D') res+=12;
if (s[0]=='I') res+=20;
}
cout << res << endl;
return 0;
}
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