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#include <bits/stdc++.h>

using namespace std;

char t;
int n, cnt, wyn;
bool check;

int main() {
    ios_base::sync_with_stdio(0);

    cin >> n;

    int cnt = n / 10;

    int licz = 0;
    for (int i = 1; i <= 10; i++) {
        check = true;
        for (int j = 1; j <= cnt; j++) {
            cin >> t;
            if (t == 'N') check = false;
        }

        if (check) {
            wyn++;
        }
    }

    cout << wyn;
}