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#!/usr/bin/env python3
# coding=utf-8

# Copyright (C) 2022  Paweł Widera
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details:
# http://www.gnu.org/licenses/gpl.html

import sys
import numpy

n = int(input())
step = n // 10

results = [1 if x == "T" else 0 for x in input()]
total = sum(sum(results[i:i + step]) == step for i in range(0, n, step))

print(total)