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#include <bits/stdc++.h>
using namespace std;
 
#define REP(i, n) for (int i = 0; i < (n); ++i)
#define EACH(it, cont) for (auto &it : cont)
#define FOR(i, b, e)  for (int i = (b); i <= (e); ++i)
#define FORD(i, b, e) for (int i = (b); i >= (e); --i)
#define ALL(c)   begin(c), end(c)

#define dump     fancy_dumper::DumpFirst<&std::cerr>(),
#define say      fancy_dumper::DumpFirst<&std::cout>(),
#define $dump    fancy_dumper::Dumper<&std::cerr>
#define $say     fancy_dumper::Dumper<&std::cout>
#define $(x) #x, fancy_dumper::ToggleSeparator(), (x),\
				 fancy_dumper::ToggleSeparator()
 
namespace fancy_dumper {
 
struct ToggleSeparator { };
 
template<std::ostream *Out>
struct DumpFirst { };
 
template<std::ostream *Out>
struct Dumper {
	static void *&last() {
		static void *p;
		return p;
	}
	static const char *&separator() {
		static const char *s = " ";
		return s;
	}
	static const char *&separatorNewLine() {
		static const char *s = "\n";
		return s;
	}
	static const char *&unseparator() {
		static const char *s = "=";
		return s;
	}
	Dumper() {
		last() = this;
	}
	~Dumper() {
		if (this == last()) {
			*Out << separatorNewLine();
			last() = 0;
		}
	}
	Dumper operator, (ToggleSeparator) {
		std::swap(separator(), unseparator());
		return Dumper();
	}
};
 
template<std::ostream *Out, class T>
Dumper<Out> operator,(Dumper<Out>, const T &e) {
	*Out << Dumper<Out>::separator() << e;
	return Dumper<Out>();
}
 
template<std::ostream *Out, class T>
Dumper<Out> operator, (DumpFirst<Out>, const T &e) {
	*Out << e;
	return Dumper<Out>();
}
 
}
 
template<class T, class Y>
std::ostream &operator<< (std::ostream &o, const std::pair<T, Y> &p) {
	return o << p.first << ' ' << p.second;
}
 
template<class T>
std::ostream &operator<< (std::ostream &o, const std::vector<T> &v) {
	bool isBegin = true;
	EACH (e, v) {
		if (!isBegin) { o << ' '; }
		isBegin = false;
		o << e;
	}
	return o;
}
 
template<class T>
std::ostream &operator<< (std::ostream &o, const std::set<T> &v) {
	bool isBegin = true;
	EACH (e, v) {
		if (!isBegin) { o << ' '; }
		isBegin = false;
		o << e;
	}
	return o;
}

template<class T>
std::ostream &operator,(std::ostream &o, const T &t) {
	return o << t;
}
 
struct StdinReader {
	StdinReader() { std::ios::sync_with_stdio(0); }
} stdinReader;
#define get stdinReader,
 
template<class T> StdinReader &operator, (StdinReader &sr, T &t) { std::cin >> t; return sr; }
template<class T> StdinReader &operator, (StdinReader &sr, std::vector<T> &v) { EACH (x, v) sr, x; return sr; }
template<class T, class U> StdinReader &operator, (StdinReader &sr, std::pair<T, U> &p) { return sr, p.first, p.second; }

struct GetSizeHelper {
	int s;
	operator int  () const { return s; }
	operator bool () const { return s; }
	template<class T> GetSizeHelper(const T &t) : s((int) size(t)) {}
};
#define isize (GetSizeHelper) 
template <class T, class U> bool remin(T &a, const U &b) { return b < a ? a = b, true : false; }
template <class T, class U> bool remax(T &a, const U &b) { return b > a ? a = b, true : false; }

const int inf = 1000000001;
using ll = long long;

// code starts here

int main() {
	int n;
	string s;
	get n, s;
	int x = n / 10;
	int ans = 0, pos = 0;
	REP (i, 10) {
		int ok = 1;
		REP (j, x) {
			ok &= s[pos++] == 'T';
		}
		ans += ok;
	}
	say ans;
}