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import sys

def chunks(data, n):
    return [data[i*n:(i+1)*n] for i in range(len(data)//n)]

n = int(input())
tests = input()
chunksize = n//10
score = 0

for chunk in chunks(tests, chunksize):
    if all(c == "T" for c in chunk):
        score += 1

print(score)