#include <iostream>
using namespace std;

int main()
{
    int n, counter = 0;
    cin >> n;
    string t;
    cin >> t;
    int subcounter = 0;
    for (int i = 0; i < n; i++)
        {
            if (t[i] == 'N')
            {
                subcounter = 0;
                continue;
            }
            else
            {
                subcounter++;
            }
            if (subcounter == n/10)
            {
                counter++;
                subcounter = 0;
            }
        }
    cout << counter << endl;
    return 0;
}