Editorial for COCI '07 Contest 3 #1 Cetiri

Remember to use this editorial only when stuck, and not to copy-paste code from it. Please be respectful to the problem author and editorialist.
Submitting an official solution before solving the problem yourself is a bannable offence.

There are many possible solutions. One is to loop through all values between (say) -200 and 200, and see if it forms an arithmetic progression with the three given numbers. Others calculate the result from the given numbers using arithmetic.


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