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#include <iostream>

int main()
{
    int n, res = 0;
    char data[101];
    std::cin >> n >> data;
    bool passed;
    for (int i = 0; i < 10; i++)
    {
        passed = true;
        for (int j = 0; j < n / 10; j++)
        {
            if (data[i * n / 10 + j] == 'N')
            {
                passed = false;
                break;
            }
        }
        if (passed)
        {
            res++;
        }
    }
    std::cout << res;
}