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#include <iostream>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n, p = 0;
    char c;
    cin >> n;
    for (int i = 0; i < 10; i++)
    {
        bool ok = true;
        for (int j = 0; j < n / 10; j++)
        {
            cin >> c;
            if (c == 'N') ok = false;
        }
        if (ok) p++;
    }

    cout << p;

    return 0;
}