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#include <iostream>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n; cin >> n;
    int k = n/10;
    int ans = 0;
    for (int i = 0; i < 10; i++)
    {
        bool passed = true;
        for (int j = 0; j < k; j++)
        {
            char c; cin >> c;
            if (c == 'N') passed = false;
        }
        if (passed) ans++;
    }
    cout << ans;
}