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#include <iostream>
using namespace std;
int main()
{
    int n, pkt=0;
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n;
    int x = n / 10;
    string testy;
    cin >> testy;
    for (int i = 0; i*x < n; i++) {
        int j = 0;
        bool check = true;
        while (j < x) {
            if (testy[i * x + j] == 'N') {
                check = false;
                break;
            }
            j++;
        }
        if (check) pkt++;
    }
    cout << pkt;
}