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#include "bits/stdc++.h" // Ignacy Boehlke
using namespace std;     // XIII LO Szczecin
template<class A,class B>ostream&operator<<(ostream&os,pair<A,B>p){return os<<'{'<<p.first<<", "<<p.second<<'}';}
template<class T>auto operator<<(ostream&os,T v)->decltype(v.end(),os){os<<'{';int i=0;for(auto e:v)os<<(", ")+2*!i++<<e;return os<<'}';}
#ifdef DEBUG
#define LOG(x...)cerr<<"["#x"]: ",[](auto...$){((cerr<<$<<"; "),...)<<'\n';}(x)
#else
#define LOG(...)(void)0
#endif
#define ssize(x)((int)x.size())
#define FOR(a,b,c)for(int a=(b);a<=(c);a++)
#define REP(a,b)FOR(a,0,(b)-1)
#define ALL(x)(x).begin(), (x).end()
#define fi first
#define se second
using ll=long long;

int main() {
	cin.tie(0)->sync_with_stdio(0);
	int n;
	cin >> n;
	string s;
	cin >> s;
	int c = n / 10, res = 0;
	REP(g, 10) {
		bool ok = true;
		REP(i, c) ok = ok && s[g * c + i] == 'T';
		res += ok;
	}
	cout << res << '\n';
}