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#include <cstdio>
using namespace std;

const int N = 100 + 9;

char buf[N];
int groupScore[10];

int main() {
	int n;
	scanf("%d%s", &n, buf);
	int groupSize = n / 10;

	for (int i=0; i<10; ++i) groupScore[i] = 0;
	for (int i=0; i<n; ++i) if (buf[i] == 'T') groupScore[i/groupSize]++;
	int score = 0;
	for (int i=0; i<10; ++i) if (groupScore[i] == groupSize) ++score;

	printf("%d\n", score);

	return 0;
}