public class Fibonacci {

    long f(int n){
        if(n == 0) return 1;
        if(n == 1) return 1;
        return(f(n - 1) + f(n - 2));
    }


    public static void  main(String s[]){
        Fibonacci ff = new Fibonacci();
        long rez = ff.f(60);
        System.out.println(rez);
    }
}