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#include <bits/stdc++.h>
using namespace std;

int main()
{
    int n, res = 0;
    string s;
    cin >> n >> s;
    int block = n / 10;
    for(int i = 0; i < n; i+=block)
    {
        if(s.substr(i, block).find('N') == string::npos)
            ++res;
    }
    cout << res << endl;
}