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/*
	Zadanie: Liczenie punktów
	Autor: Tomasz Kwiatkowski
*/

#include <bits/stdc++.h>

#define fi first
#define se second
#define pb push_back

using namespace std;
typedef long long ll;

int main()
{
	ios_base::sync_with_stdio(0); cin.tie(0);
	
	int n;
	cin >> n;
	string s;
	cin >> s;
	int res = 0;
	for (int i = 0; i < n; i += n / 10) {
		char c = s[i];
		for (int j = 1; j < n/10; ++j)
			if (c != s[i+j]) c = '#';
		if (c == 'T')
			++res;
	}
	cout << res << '\n';
	return 0;
}