#include <iostream>
#include <algorithm>
#define mod 23

using namespace std;

int main()
{
    int A[102], a, N, cnt = 0;
    cin >> N;
    for( int i = 1; i <= N; ++i )
    {
        cin >> a;
        A[i] = a % 23;
    }

    sort( A + 1, A + 1 + N );

    for( int i = 1; i <= N; ++i )
    {
        if( A[i] != A[i + 1] )
            cnt++;
    }

    cout << cnt;
    return 0;
}