public class Fibonacci {
  
  public static int fibonacci(int n) {
    if (n == 0)
      return 0;
    else if (n == 1)
      return 1;
    else {
      int f1 = fibonacci(n-1);
      int f2 = fibonacci(n-2);
      int ris = f1 + f2;
      return ris;
    }
  }

  public static void main(String[] args) {
    int alfa = 0;
    alfa = fibonacci(4);
    System.out.println(alfa);
  }
}