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Where are you stuck?
if(a > b + c )
This condition will evaluate to true if a is bigger than the sum of b and c. Is this what you want? Don't you want to a be bigger than b and bigger than c?
Did...

Why are you lost? You are in the right direction. You just need to check again the if statement syntax.

if(a > b & c)

Firstly, you should better use the logical operator && instead of the...