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#include <bits/stdc++.h>

using namespace std;

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

    int n, counter = 0;
    cin >> n;

    string in;
    cin >> in;

    for (int i = 0; i < 10; i++)
    {
        bool isItRight = true;
        for (int j = i * (n / 10); j < i * (n / 10) + n / 10; j++)
        {
            if (in[j] == 'N')
            {
                isItRight = false;
                break;
            }
        }
        if (isItRight)
            counter++;
    }

    cout << counter;
}