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#include <iostream>

int main() {
    unsigned int n;
    unsigned int batch_size;
    char c;
    unsigned int test_passed{0};
    bool passed;
    std::cin >> n;
    batch_size = n/10;
    for (size_t i = 0; i < 10; i++) {
        passed = true;
        for (size_t j = 0; j < batch_size; j++) {
            std::cin >> c;
            if (c == 'N') {
                passed = false;
            }
        }
        test_passed += passed;
    }
    std::cout << test_passed << std::endl;
    return 0;
}