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#include <stdio.h>

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

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

	int chunk = n / 10;
	int c = 0;
	bool passed = true;
	int total = 0;
	for (int i = 0; i < n; ++i)
	{
		passed = passed && (word[i] == 'T');
		++c;
		if (c == chunk)
		{
			if (passed)
			{
				++total;
			}
			c = 0;
			passed = true;
		}
	}

	printf("%d\n", total);
	return 0;
}