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I don't understand how the AddRoundKey function works, because the following example is from the cipher authors. I'm trying to add $76$ and $7D$, and my result is $F3$. Could someone explain this?

8F 20 3E 06 5F C3 54 45 B5 FE B9 AC A7 A0 C6 76 +
86 2F 1F 65 3B 77 5B A1 D0 5C BC 2F 38 E2 D8 7D =
16 50 5E 6B 9B 3A B1 E6 86 5B 77 DC E0 82 A0 F4
Mahesh S R
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