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#include <iostream>
#define GET_VALUE(value_) (std::cin >> (value_))
#define FOR(size_, iname_) for (int iname_ = 0; iname_ < (size_); ++iname_)
#define GETT(type_, name_) for (type_ name_, name_##_marker_ = 1; name_##_marker_ && (GET_VALUE(name_), 1); --name_##_marker_)
#define GET(name_) GETT(int, name_)
#define GETS(name_) for (std::string name_, name_##_marker_ = "1"; name_##_marker_ == "1" && std::cin >> name_; name_##_marker_ = "")
#define PUTN(value_) std::cout << (value_)
#define PUT(value_) PUTN(value_) << "\n"
int main() {
  GET(n)
  GETS(s) {
    char const *p = &s[0];
    int result = 0;
    int n10 = n / 10;
    FOR(10, i) {
      int error = 0;
      FOR(n10, j)
      error |= (*p++ != 'T');
      result += !error;
    }
    PUT(result);
  }
}