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#include <cstdio>

const int max_n = 10000;
int n;
char input[max_n];

int main() {
  scanf(" %d %s ", &n, input);
  int count = 0;
  for (int i = 0; i < 10; ++i) {
    int good = 0;
    for (int j = 0; j < n / 10; ++j) {
      good += input[i * (n / 10) + j] == 'T';
    }
    count += good == n / 10;
  }
  printf("%d\n", count);
  return 0;
}