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#include <iostream>

int main() {
    int size;
    std::string results;
    std::cin >> size;
    std::cin >> results;
    int group = size / 10;
    int points = 0;
    for (int i = 0; i < 10; ++i) {
        bool result = true;
        for (int j = 0; j < group; ++j) {
            if (results[i*group+j] == 'N') {
                result = false;
                break;
            }
        }
        if (result) {
            points++;
        }
    }
    std::cout << points << std::endl;
    return 0;
}