[![enter image description here][1]][1]


I learn from a minithesis to understand RC5.
As we can see at the formula, the round 0 must be using A=A+S[0], because the loop is starting at r(round) 1.

I tried addition and OR(bitwise) to get the answer DA679BFB but keep missing, Here is my result of calculating.

    A = A + S[0]
    
      = 4B726970 + BF0A8B1D
    
      = 10A7CF48D


    A = A OR S[0]
    
      = 4B726970 OR BF0A8B1D
    
      = FF7AEB7D


The S Data is the result of 3rd phase key expanding on RC5. I really need help because I have been stuck here for 2 days and thank you in advance.


  [1]: https://i.sstatic.net/nbuYi.png