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il = int(input())
inp = input()
inp = [*inp]

il = il/10
i = 0
score = 0
while i != 10:
    j = 0
    answer = 0
    while j != il:
        if inp[int(i * il + j)] == "T":
            answer += 1
        j += 1
    if answer == il:
        score += 1

    i += 1
print(score)