public void set(int index, long value) {final int o = index / 21;final int b = index % 21;final int shift = b * 3;blocks[o] = (blocks[o] & ~(7L << shift)) | (value << shift);}

public override void Set(int index, long value){int o = index / 21;int b = index % 21;int shift = b * 3;blocks[o] = (blocks[o] & ~(7L << shift)) | (value << shift);}
