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#include <iostream>
using namespace std;

int n;

void solve() {
    char a;
    int ans = 0;
    cin >> n;
    for (int i = 0; i < 10; i++) {
        int t = true;
        for (int j = 0; j < n / 10; j++) {
            cin >> a;
            if (a == 'N')
                t = false;
        }
        if (t == true) 
            ans++;
    }
    cout << ans << "\n";
}

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