#include <iostream>
using namespace std;
 
    enum class Fruit
    {
      apple,
      banana,
      orange,
      pineapple,
      lemon
    };
    Fruit& operator++(Fruit& f)
    {
      switch (f)
      {
      case Fruit::apple: return f = Fruit::banana;
      case Fruit::banana: return f = Fruit::orange;
      case Fruit::orange: return f = Fruit::pineapple;
      case Fruit::pineapple: return f = Fruit::lemon;
      case Fruit::lemon: return f = Fruit::apple;
      }
    }
 
int main() {
	// your code goes here
	Fruit f = Fruit::banana;
 
	cout << (int)++f << endl;
 
	return 0;
}

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