Question $13$

$(1)$

$.$ Max. score: $20\mathrm{.}00$

Resource power

Given A number of small$-$size resources and $B$ number of medium$-$size resources and $C$ number of large$-$size resources. A valid resource system is a system of $3$ resources in which all resources are of the same type or all resources are of a different type.

You are given integers $A,B,$ and $C.$ Print the maximum number of valid resource systems you can make with available resources.

Function description

Complete the function Resource$().$ This function takes the following $3$ parameters and returns the required answer:

$A$: Represents the number of small$-$sized resources