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#include <bits/stdc++.h>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    int n;
    cin >> n;
    string s;
    cin >> s;
    int w = 0;
    int k = 0;
    for (int i = 0; i < n; i += n / 10)
    {
        bool v = 1;
        for (int j = 0; j < n / 10; j++)
        {
            if (s[k++] == 'N')
                v = 0;
        }
        w += v;
    }
    cout << w << '\n';
}