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#include <iostream>

int score_group(char* tests, int len) {
    for (int i = 0; i < len; i++) {
        if (tests[i] == 'N')
            return 0;
    }
    return 1;
}


void solution(std::istream &instream, std::ostream &outstream) {
    int n;
    char* tests = new char[200];

    instream >> n;
    instream >> tests;

    int result = 0;
    for (int start = 0; start < n; start += n / 10) {
        result += score_group(tests + start, n / 10);
    }

    outstream << result;
}

int main() {
    solution(std::cin, std::cout);
    return 0;
}