/* compilation command: "g++ -g3 -o three-functions three-functions.cpp" */
#include <iostream>

int select(int a, int b)
{
   if(a%2 == 0) return a;
   else return b;
}

int user_input()
{
   int y = 0, z = 0;
   std::cin >> y >> z;
   return select(y, z);
}

int main()
{
   int x = user_input();
}