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// C1-PUN.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>

using namespace std;

int main()
{
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(NULL);

    int n;
    cin >> n;

    string s;
    cin >> s;

    int nByTen = n / 10, points = 0;
    bool pointed;
    for (int i = 0; i < 10; i++) {
        pointed = true;
        for (int j = 0; j < nByTen; j++) {
            if (s[i * nByTen + j] == 'N') {
                pointed = false;
                break;
            }
        }
        if (pointed) points++;
    }
    cout << points;
    
}

// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

// Tips for Getting Started: 
//   1. Use the Solution Explorer window to add/manage files
//   2. Use the Team Explorer window to connect to source control
//   3. Use the Output window to see build output and other messages
//   4. Use the Error List window to view errors
//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file