public static int calculateRequiredValidatorQuorum(final int validatorCount) {
    final int F = (validatorCount - 1) / 3;
    return (2 * F) + 1;
  }
Calculate required validator quorum.

@param validatorCount the validator count
@return the int
consensus/ibftlegacy/src/main/java/org/hyperledger/besu/consensus/ibftlegacy/IbftHelpers.java