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#include <iostream>
#include <vector>

using namespace std;

int main() {
    ios_base::sync_with_stdio(0);
    int n;
    cin >> n;
    string text;
    cin >> text;
    int group = n / 10;
    int result = 0;
    for(int i = 0; i < text.size(); i += group) {
        bool success = true;
        for(int j = i; j < i + group; j++) {
            if(text[j] == 'N') {
                success = false;
                break;
            }
        }
        result += success;
    }
    cout << result << "\n";
}