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#include<iostream>

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(NULL);

    int n;
    std::string s;

    std::cin >> n >> s;

    int l = n / 10;
    int res = 0;

    for (int i = 0; i < 10; i++) {
        int inc = 1;
        for (int j = l * i; j < l * (i + 1); j++ ) {
            if (s[j] == 'N') {
                inc = 0;
                break;
            }
        }
        res += inc;
    }

    std::cout << res << "\n";

    return 0;
}