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#include <cstring>
#include <cstdio>
#include <cstdlib>


using namespace std;

int main()
{
	int n;
	char w[101];

	scanf("%d", &n);
	scanf("%s", w);

	int res = 0;

	for (int i = 0; i < 10; i++)
	{
		bool ok = true;
		for (int j = 0; j < n / 10; j++)
		{
			if (w[i * n / 10 + j] != 'T')
			{
				ok = false;
			}
		}
		if (ok)
		{
			res++;
		}
	}
	printf("%d", res);
	return 0;
}