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#include <cstdio>
#include <iostream>
#include <algorithm>

using namespace std;

int main() {
  int n;
  int set_size;
  string results;
  int result = 0;

  cin >> n >> results;

  set_size = results.length()/10;

  for (int i=0; i<results.length(); i+=set_size) {
    string set_result = results.substr(i, set_size);

    if (count(set_result.begin(), set_result.end(), 'T') == set_size) {
      result++;
    }
  }

  cout << result << endl;

  return 0;
}