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#include <bits/stdc++.h>

using namespace std;

int main()
{
  std::ios::sync_with_stdio(false);

  int N, ret = 0;
  cin >> N;
  string in;
  cin >> in;
  vector<bool> groups(10, true);
  int numOfTestInGroup = in.size() / 10;
  for (size_t i = 0; i < in.size(); ++i)
  {
    groups[i / numOfTestInGroup] = groups[i / numOfTestInGroup] && in[i] == 'T';
  }
  for (auto a : groups)
    ret += a ? 1 : 0;
  cout << ret << endl;
  return 0;
}