#include <bits/stdc++.h>
using namespace std;
int main() {
    set <string> S;
    int n;cin >> n;
    for (int i=1;i<=n;i++) {
        string s;
        cin >> s;
        S.insert(s);
    }
    cout << 52 - S.size() << endl;
    return 0;
}