#include <iostream>
#include <fstream>
#include <deque>
#include <algorithm>
#include <unordered_map>
using namespace std;

ifstream f("mindcoding.in");
int n, a, b, c, d, x, y, mx, k;
unordered_map<int, int> h;
int main()
{
    cin>>n;
    for(int i=0; i<n; ++i)
        cin>>a, h[a%23]=1;
    cout<<h.size();;


    return 0;
}