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#include <iostream>

using namespace std;

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

    int n;
    cin >> n;
    int d = n / 10;
    string input;
    cin >> input;

    int result = 0;
    for (int i = 0; i < 10; ++i) {
        bool good = true;
        for (int j = 0; j < d; ++j) {
            if (input[i * d + j] == 'N') {
                good = false;
                break;
            }
        }
        if (good) {
            ++result;
        }
    }

    cout << result;

    return 0;
}