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#include <iostream>
#include <string>

int main() {
    std::string line1;
    std::getline(std::cin, line1);
    int n = std::stoi(line1);

    std::string results;
    std::getline(std::cin, results);

    int numberOfTestsInGroup = n / 10;
    int numberOfGroups = n / numberOfTestsInGroup;

    int points = 0;
    int groupPoints;

    for (int group = 0; group < numberOfGroups; group++) {

        int startIndex = group * numberOfTestsInGroup;
        groupPoints = 1;

        for (int i = 0; i < numberOfTestsInGroup; i++) {
            if (results[startIndex + i] == 'N') groupPoints = 0;
        }
        points = points + groupPoints;
    }

    std::cout<<points;
}