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#include <iostream>

int main() {
    int test_count;
    std::cin >> test_count;

    std::string test_results;
    std::cin >> test_results;

    int test_size = test_count / 10;

    int all_points = 10;
    for (int i = 0; i < test_count; ++i) {
        if (test_results[i] == 'N') {
            i = (i / test_size * test_size) + test_size - 1;
            all_points--;
        }
    }

    std::cout << all_points;

    return 0;
}