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#include <bits/stdc++.h>

#define fi first
#define se second

#define pb push_back

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int n;
    cin >> n;

    std::string testy;
    cin >> testy;

    int wynik = 0;

    for (int pT = 0; pT < n; pT += n / 10)
    {
        bool grupa = true;
        for (int i = pT; i < pT + n / 10; i++)
        {
            if (testy[i] == 'N')
                grupa = false;
        }

        if (grupa)
            wynik++;
    }

    cout << wynik << '\n';

    return 0;
}