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#include <iostream>
#include <string>

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

  int n; std::cin >> n;
  int help = n / 10;

  std::string s;
  std::cin >> s;

  int res = 0;

  for (int i = 0; i < s.size(); i += help) {
    bool ok = true;
    for (int j = i; j < i + help; j++)
      ok &= (s[j] == 'T');

    if (ok)
      res ++;
  }
  std::cout << res << '\n';
}