#include <iostream>
#include <algorithm>
using namespace std;
int i,n;
int a[101],j,res;
int main()
{
    cin>>n;
    for(i=1; i<=n; ++i)
    {
        int x;
        cin>>x;
        a[i]=x%23;
    }

  sort(a+1,a+n+1);
  for(i=1;i<=n;i++) if(a[i]!=a[i+1]) res++;
    cout<< res%23;
    return 0;
}