#include <fstream>
using namespace std;
int main()
{
    ifstream f("U23.in");
    ofstream g("U23.out");
    unsigned N,i,x=0,j,aux;
    f>>N;
    int v[N];
    for(i=0;i<N;i++)
    {
        f>>v[i];
        v[i]=v[i]%23;
        aux=0;
        for(j=0;j<i&&aux==0;j++)
            if(v[j]==v[i])
                aux=1;
        if(aux==0)
            x++;
    }
    f.close();
    g<<x;
    g.close();
    return 0;
}