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#include <iostream>

int main() {
    int size = 0;
    std::string s;
    std::cin >> size >> s;
    int blockSize = s.length() / 10;
    int score = 0;
    for (int i = 0; i < s.length(); i += blockSize) {
        bool valid = true;
        for (int j = i; j < i + blockSize; ++j) {
            if (s[j] == 'N') {
                valid = false;
            }
        }
        score += valid;
    }

    std::cout << score << std::endl;
    return 0;
}