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#include <bits/stdc++.h>

using namespace std;

int main()
{
    int n;
    cin >> n;
    int t = n / 10;
    int res =0;
    while (n > 0)
    {
        bool dupa = true;
        for(int k = 0; k < t; k++)
        {
            char test;
            cin >> test;
            if (test == 'N') dupa = false;
        }
        n -= t;
        if (dupa) res++;
    }
    cout << res << '\n';
}