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#include <algorithm>
#include <cstdint>
#include <ios>
#include <iostream>
#include <iterator>
#include <string>
#include <vector>

template <typename T> void print_value(const T &v);

template <typename T> void debug(const T &v, const std::string &s) {
  std::cerr << s << ": '";
  print_value(v);
  std::cerr << "'\n";
}

template <> void print_value(const std::vector<int32_t> &v) {
  for (const auto x : v) {
    std::cerr << x << " ";
  }
}

template <typename T> void print_value(const T& v) { std::cerr << v; }

int main() {
  std::ios_base::sync_with_stdio(false);
  std::cin.tie(NULL);
  std::string responses;
  int n;
  std::cin >> n;
  std::cin.ignore();
  const int tenth = n / 10;
  int result = 0;
  std::getline(std::cin, responses);
  if (responses.length() != n) {
    std::cerr << "Bad length!\n";
    return 1;
  }
  for (int i = 0; i < 10; ++i) {
    int batch_ok = true;
    for (int j = 0; j < tenth; ++j) {
      if (responses[tenth * i + j] == 'N')
        batch_ok = false;
    }
    if (batch_ok) {
        result++;
    }
  }
  std::cout << result;

  return 0;
}