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#include <iostream>
#include <string>

int main()
{
	int iResult = 0;
	int iCnt;
	std::string s;

	std::cin >> iCnt;
	std::cin >> s;

	int iGroupSize = iCnt / 10;

	const char* p = s.c_str();

	for (int i = 0; i < 10; ++i)
	{
		int iOK = 0;

		for (int j = 0; j < iGroupSize; ++j)
		{
			if (*p++ == 'T')
				iOK++;
		}

		if (iOK == iGroupSize)
			iResult++;
	}

	std::cout << iResult;
}