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#include <algorithm>
#include <deque>
#include <iostream>
#include <set>
#include <string>
#include <vector>

using namespace std;

using ll = long long;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  string s;
  cin >> n;
  cin >> s;
  int ret = 0;
  for (int i = 0; i < 10; i++) {
    bool valid = true;
    for (int j = 0; j < n / 10; j++) {
      if (s[i * n / 10 + j] == 'N') {
        valid = false;
      }
    }
    if (valid) {
      ret++;
    }
  }
  cout << ret << "\n";
}