public Element fromMontgomery() {
    UInt256 calc = add(this.value);
    calc = add(calc);
    calc = add(calc);
    calc = add(calc);

    if (calc.greaterThan(Q_MODULUS.value)) {
      return new Element(calc.subtract(Q_MODULUS.value));
    }
    return new Element(calc);
  }
fromMontgomery converts the element from Montgomery to regular representation sets and returns
z = z * 1

@return z * 1
ethereum/verkletrie/src/main/java/org/hyperledger/besu/ethereum/verkletrie/bandersnatch/fp/Element.java