#include <iostream>

using namespace std;
int n, a, g[102], i, k;

int main()
{
    cin >> n;
    for( i = 1; i <= n; i++ )
    {
        cin >> a;
        g[a % 23]++;
    }
    for( i = 0; i <= 23; i++ )
        if(g[i] != 0)
            k++;
    cout << k;
    return 0;
}