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#include <iostream>

int main()
{
	int testCount = 0;
	// Enter a number of tests
	std::cin >> testCount;
	// Enter string of 'T's and 'N's
	char *testString = new char[testCount];

	for (int i = 0; i < testCount; i++)
	{
		std::cin >> testString[i];
	}

	int result = 0;
	for (int i = 0; i < 10; i++)
	{
		bool testPassed = true;
		int testNum = testCount / 10;
		for (int j = 0; j < testNum;j++)
		{
			if (testString[i * testNum + j] == 'N')
			{
				testPassed = false;
				break;
			}
		}
		result += testPassed ? 1 : 0;
	}

	std::cout << result;

	return 0;
}