Cheat Engine

[ch87819]

HI guys, I try to learn how to modify infinite HP, and i found the code[the code that the enetmy hit me], here it is
originalcode:
mov [esi+38],ax
jg viking.exe+14E03F

exit:
jmp returnhere

"viking.exe"+14E010:
jmp newmem
nop
returnhere:
so, what shoold i do to make it never decrease?

[majmun]

mov [esi+38],#1000 // <----example: Replace ax with certain value example
jg viking.exe+14E03F

exit:
jmp returnhere

"viking.exe"+14E010:
jmp newmem
nop