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#include <iostream>
using namespace std;
int wynik = 10, j, n;
string s;
bool t = true;
int main()
{
    cin >> n >> s;
    for (int i = 0; i < n; ++i)
    {
        j = i;
        for (int a = i; j < i + (n/10); ++j)
        {
            if(s[i] == 'N')
            {
                t = false;
            }
        }
        i = j - 1;
        if (!t)
        {
            --wynik;
        }
        t = true;
    }
    cout << wynik;
    return 0;
}