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#include <iostream>

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

    int n; std::cin >> n;

    int result = 0;
    bool correct;

    for (int i = 0; i < 10; i++)
    {
        correct = true;

        for (int j = 0; j < n / 10; j++)
        {
            char letter; std::cin >> letter;
            if (letter == 'N') correct = false;
        }
        
        if (correct) result++;
    }

    std::cout << result;
    
    return 0;
}