백준 9단계 no.2

import java.util.*;

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

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();

        System.out.println(fibonacci(n));
    }
}