#include <iostream>

using namespace std;

int marc[22];
int n;
int nr;

void citire()
{
    cin>>n;
    int a;
    for(int i=1;i<=n;++i)
    {
        cin>>a;
        nr += (marc[a%23]==0);
        marc[a%23] = 1;
    }
}

int main()
{
    citire();
    cout<<nr;
    return 0;
}