#include<bits/stdc++.h>
using namespace std;
vector<string>x;
bool my_find(string z){
	for(int i = 0;i<x.size();i++){
		if(z==x[i]){
			return 1;
		}
	}
	return 0;
}
int main() {
	int n;
	cin >> n;

	for(int i = 0;i<n;i++){
		string p;
		cin  >> p;
		if(my_find(p)){
			continue;
		}		
		x.push_back(p);
	}
	cout << 52-x.size();
	return 0;
}