#include<fstream>
#include<iostream>
using namespace std;
ifstream f("input");
ofstream g("output");
int n, v[101];
int main()
{
    f>>n;
    for(int i=1;i<=n;++i)
    {
        f>>v[i];
        v[i]%=23;
    }
    int counter=0,analog;
    for(int i=1;i<=n;++i)
    {
        analog=v[i];
        if(v[i]!=-5)
            ++counter;
        for(int j=1;j<=n;++j)
        {
            if(v[j]==analog)
                v[j]=-5;
        }
    }
    g<<counter;
    g.close();
    return 0;
}