Column to check the difference

Check.png

HI Experts,
I need some help with an excel formula ,as below. I have a check function column which would see if in column A 2013 -2012 is 0 if it is not 0 then it should say the value is changed and this apples for the whole row means for COL B and Col C.
So I want an IF condition for Check Column which validates Col A OR Col B OR Col C 2013-2012

Col A Col B Col C Check
2013 2012 2013 2012 2013 2012

Thanks a lot
Raj