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// pun
#include <bits/stdc++.h>
#include <cstdio>
#include <iostream>

//#define TEST

using namespace std;

#define FAST                                                                             \
  ios_base::sync_with_stdio(0);                                                          \
  cin.tie(0);

#define pb push_back
#define mp make_pair

#define fi(a, b) for (int i = a; i <= b; i++)
#define fj(a, b) for (int j = a; j <= b; j++)
#define fo(a, b) for (int o = a; o <= b; o++)

#define fdi(a, b) for (int i = a; i >= b; i--)
#define fdj(a, b) for (int j = a; j >= b; j--)
#define fdo(a, b) for (int o = a; o >= b; o--)

#define sz(x) (int)x.size()

#define init_v(tab, n) fo(1, n) tab.pb(0)

typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef pair<int, int> pii;
typedef vector<pii> vpii;
typedef pair<ll, ll> pll;
typedef vector<pll> vpll;
typedef vector<ll> vll;

template <typename T> ostream &operator<<(ostream &os, vector<T> v) {
  fi(0, sz(v) - 1) os << v[i] << " ";
  return os;
}
template <typename A, typename B> ostream &operator<<(ostream &os, pair<A, B> p) {
  os << "(" << p.first << ", " << p.second << ")";
  return os;
}
template <typename T> ostream &operator<<(ostream &os, set<T> t) {
  for (auto z : t)
  {
    os << z << " ";
  }
  return os;
}
template <typename T1, typename T2> ostream &operator<<(ostream &os, map<T1, T2> t) {
  cerr << endl;
  for (auto z : t)
  {
    os << "\t" << z.first << " -> " << z.second << endl;
  }
  return os;
}

#ifdef TEST
#define dbg(x)                                                                           \
  { cerr << __LINE__ << "\t" << #x << ": " << x << endl; }
#define dbg0(x, n)                                                                       \
  {                                                                                      \
    cerr << __LINE__ << "\t" << #x << ": ";                                              \
    for (int ABC = 0; ABC < n; ABC++)                                                    \
      cerr << x[ABC] << ' ';                                                             \
    cerr << endl;                                                                        \
  }
#else
#define dbg(x) ;
#define dbg0(x, n) ;
#endif

void przekierowanie() {
#ifdef TEST
  freopen("input.txt", "r", stdin);
  freopen("output.txt", "w", stdout);
#endif
}

int main() {
  FAST przekierowanie();
  long N;
  cin >> N;
  string zadania;
  cin >> zadania;

  long lzad = N / 10;
  long wynik = 0;
  int pos = 0;
  fi(1, 10) {
    bool wsk = true;
    fj(1, lzad) {
      auto w = zadania[pos];
      pos++;
      if (w != 'T') wsk = false;
    }
    if (wsk) wynik++;
  }
  cout << wynik << endl;
  return 0;
}