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#include <iostream>
using namespace std;

int main()
{
    int n, current = 0, result = 0;
    string tests;
    cin >> n >> tests;
    for (int i = 0; i < 10; i++) {
        bool is_correct = 1;
        for (int j = 0; j < n / 10; j++)
            if (tests[current++] == 'N')
                is_correct = 0;
        result += is_correct;
    }
    cout << result;
}