Evaluate the number of functions f:{1,2,3,4,5}→{1,2,3,4,5}f: \{1, 2, 3, 4, 5\} \to \{1, 2, 3, 4, 5\}f:{1,2,3,4,5}→{1,2,3,4,5} such that f(i)≠if(i) \neq if(i)=i for all iii and f(f(i))=if(f(i)) = if(f(i))=i.
10
15
20
26