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n = int(input())
a = input()
dob = 0
wyn = 0
for t in range(1,n+1):
    if a[t-1] == 'T':
        dob += 1
    if t % (n/10) == 0:
        if dob == n / 10:
            wyn += 1
            dob = 0
        else:
            dob = 0
print(wyn)