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#include <bits/stdc++.h>

int main()
{
    std::ios_base::sync_with_stdio(false);
    std::cout.tie(NULL); std::cin.tie(NULL);
    int n, ans = 0;
    std::string s;
    std::cin >> n >> s;
    for (int i = 0; i < 10; i++)
    {
        bool w = true;
        for (int j = 0; j < n / 10; j++)
        {
            if (s[(n / 10) * i + j] == 'N')
            {
                w = false;
                break;
            }
        }
        if (w)
        {
            ans++;
        }
    }
    std::cout << ans;
}