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#include <iostream>
using namespace std;
int main() {
	int z,dl;
	int dw = 0;
	int pun = 0;
	int podw = 0;
	string ciag;
	cin >> z >> ciag;
	dl = ciag.length();
	z = z / 10;
	for (int i=0; i < dl; i++) {
		dw++;
		if (ciag[i] == 'T'&& podw==z-1) {
			pun++;
			dw = 0;
			podw = 0;
		}
		else if (ciag[i] == 'T') {
			podw++;
		}
		if (dw == z) {
			dw = 0;
			podw = 0;
		}
	}
	cout << pun;
}