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#include <bits/stdc++.h>
using namespace std;template<class T>auto operator<<(ostream &o,T x)->decltype(
x.end(),o){o<<'{';int i=0;for(auto e:x)o<<(", ")+2*!i++<<e;return o<<'}';}
#ifdef DEBUG
#define LOG(x...)cerr<<"["#x"]: ",[](auto...$){((cerr<<$<<"; "),...)<<'\n';}(x)
#else
#define LOG(x...)
#endif

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	int size;
	string input;
	cin >> size >> input;

	int group_size = size / 10;
	int points = 0;

	for (int group_start = 0; group_start < size; group_start += group_size) {
		bool correct = true;

		for (int index = 0; index < group_size; index++) {
			if (input[group_start + index] == 'T')
				continue;

			correct = false;
			break;
		}

		if (correct)
			points++;
	}

	cout << points << '\n';
}