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#include <iostream>

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(NULL);
    int n;
    std::cin >> n;
    std::string s;
    std::cin >> s;
    int result = 10;

    for (int i = 0; i < 10; i++) {
        bool has_error = false;
        for (int j = 0; j < n/10; j++) {
            int ind = i * n/10 + j;
            if (s[ind] == 'N') {
                has_error = true;
                break;
            }
        }
        if (has_error) {
            result-=1;
        }
    }
    std::cout << result;
    return 0;
}