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#include <iostream>

using namespace std;

int main()
{
    int points = 0;
    int count_one_group_tests;
    int tests_count;
    string tests_correct = "";

    cin >> tests_count;
    cin >> tests_correct;

    count_one_group_tests = tests_count / 10;

    int counter = 0;
    for (int i = 0; i < tests_count; i++)
    {
        if (tests_correct[i] == 'N') {
            counter++;
            i = counter * count_one_group_tests - 1;

        }
        else if (i - counter * count_one_group_tests == count_one_group_tests - 1)
        {
            points++;
            counter++;
        }
    }

    cout << points;

}