#include <iostream>
#define MOD 23
const int NMAX = 25 ;
using namespace std ;

int F[NMAX], N, A, cnt = 0 ;

int main()
{
	
	cin >> N ;
	for(int i = 1 ; i <= N ; ++ i)
	{
		cin >> A ;
		A = A % MOD;
		F[A] = 1 ;
	}
	
	for(int i = 0 ; i <= NMAX; ++ i)
	if(F[i] == 1)
	++ cnt ;
	
	cout << cnt << '\n' ;
	return 0;
}