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#include <iostream>

using namespace std;
int main()
{
    int n;
    cin >> n;

    char* testy = new char[n];
    for (int i = 0; i < n; i++)
    {
        cin >> testy[i];
    }

    int wielkosc_grupy = n / 10;

    int suma_punktow = 10;

    for (int i = 0; i < 10; i++)
    {
        for (int j = 0; j < wielkosc_grupy; j++)
        {
            if (testy[j+wielkosc_grupy*i] == 'N')
            {
                suma_punktow--;
                break;
            }
        }
    }

    cout << suma_punktow;
   
    return 0;
}