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#define _CRT_SECURE_NO_WARNINGS

#include <cstdio>
#include <stdio.h>
#include <iostream>
#include <string.h>
#include <math.h>
#include <algorithm>
#include <vector>

int main()
{
	int n;	
	auto _ = scanf("%d\n", &n);
	std::string text;
	std::cin >> text;

	int groupSize = n / 10;
	int result = 0;

	for (int p = 0; p < n; p += groupSize)
	{
		const char* group = text.c_str() + p;
		bool shouldAddPoint = true;
		for (int i = 0; i < groupSize; i++)
		{
			if (*(group + i) == 'T') continue;
			shouldAddPoint = false;
			break;
		}
		if (shouldAddPoint) result++;
	}

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