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#include <iostream>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    int n;
    string s;
    cin >> n >> s;
    int odp = 0;
    for (int i = 0; i < 10; ++i)
    {
        bool ok = true;
        for (int j = 0; j < n / 10; ++j)
            if (s[i * n / 10 + j] == 'N')
                ok = false;
        if (ok)
            ++odp;
    }
    cout << odp;
    return 0;
}