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#include <cstdio>

int main()
{
  int n, r = 0, g = 0;
  scanf("%i ", &n);
  for (int i = 0; i<n; i++)
  {
    if (i%(n/10) == 0) g = 1;
    if (getchar() != 'T') g = 0;
    if ((i+1)%(n/10) == 0) r += g;
  }
  printf("%i\n", r);
  return 0;
}