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import sys


def _debug(*args):
    print(*args, file=sys.stderr)


def solve(input: str) -> int:
    score = 0
    group_size = len(input) // 10
    groups = (input[i:i+group_size] for i in range(0, len(input), group_size))
    for group in groups:
        if group.count('T') == len(group):
            score += 1
    return score


def main():
    n = int(sys.stdin.readline().strip())
    input = sys.stdin.readline(n)
    result = solve(input)
    sys.stdout.write(str(result))


if __name__ == '__main__':
    main()