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def count_faults(n, logs):
  """Counts the number of times a faulty server was replaced.

  Args:
    n: The number of servers.
    logs: An array of strings where each element is a log message in the format "<server_id> <success/error>".

  Returns:
    The number of times a faulty server was replaced.
  """

  server_statuses = {i: [] for i in range(1, n + 1)}  # Initialize dictionary to store server statuses
  replacements = 0

  for log in logs:
    server_id, status = log.split()
    server_statuses[int(server_id)].append(status)

    # Check if the last 3 statuses for the server are errors
    if len(server_statuses[int(server_id)]) >= 3 and all(
        s == "error" for s in server_statuses[int(server_id)][-3:]
    ):
      replacements += 1
      server_statuses[int(server_id)] = [status]  # Reset server status after replacement

  return replacements

# Example usage
n = 2
logs = ["s1 error", "s1 error", "s2 error", "s1 error", "s1 error", "s2 success"]
replacements = count_faults(n, logs)
print(replacements)  # Output: 1