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#include<iostream>
#include<string>

int calc(std::string const& tests)
{
    int n = (tests.size())/10;

    int count = 0;
    for (int i = 0; i<tests.size(); i+=n)
    {
        bool set = true;
        for (int j = i; j<i+n; ++j)
        {
            if (tests.at(j) == 'N')
            {
                set = false;
                break;
            }
        }
        if (set)
            count += 1;
    }

    return count;
}


int main()
{
    int n;
    std::cin >> n;
    std::string sign;
    std::cin >> sign;
    std::cout << calc(sign) << std::endl;
    return 0;
}