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#include <cstdio>

int main() {
  int N, p = 0;
  char str[1000];
  
  scanf("%d%s", &N, str);

  int n = N/10;
  for (int i = 0, j = 0; i < 10; ++i) {
    bool all = true;
    for (int k = 0; k < n; ++k) {
      all &= str[j++] == 'T' ;
    }
    if (all) {
      ++p;
    }
  }

  printf("%d\n", p);
  return 0;
}