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#include <iostream>
using namespace std;

int main()
{
    int n;
    int sol = 0;
    bool correct = true;
    string tests;
    cin >> n;
    cin >> tests;

    for(int i = 0; i < n; i++)
    {
        if(tests[i] == 'N')
        {
            correct = false;
        }

        if((i + 1) % (n / 10) == 0)
        {
            if(correct)
            {
                sol++;
            }

            correct = true;
        }
    }

    cout << sol;
}