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#include <iostream>
#include <string>
using namespace std;

int main () {
    int n;
    cin >> n;
    string s;
    cin >> s;

    int k= n / 10;
    int wnk= 10;

    for (int i=0; i<n; i+=k)
        for (int j=0; j<k; j++)
            if (s[i+j] == 'N') {
                wnk--;
                break;
            }
    
    cout << wnk << endl;
    return 0;
}