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#include <bits/stdc++.h>

using namespace std;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int n;
    string s;
    cin >> n >> s;

    int group_size = n / 10;

    int res = 0;
    for (int i = 0; i < 10; ++i) {
        bool ok = true;
        for (int j = 0; j < group_size; ++j) {
            if (s[i * group_size + j] == 'N') {
                ok = false;
                break;
            }
        }
        res += ok;
    }
    cout << res << "\n";
}