#include <stdio.h>
#include <math.h>

#define _ printf("%.0f\n",((pow((1 + sqrt(5)) / 2,r)) - (pow((1 - sqrt(5)) / 2,r))) / sqrt(5));
#define __ main()
#define ___ {
#define ____ }
#define _____ a
#define ______ ;
#define _______ scanf("%d",&a)
#define ________ for(int i = 0; i < a; i = -(~i))
#define _________ r
#define __________ scanf("%d",&r);
#define ___________ int
#define ____________ return 0

___________ __ ___

    ___________ _____ ______
    _______ ______

    ________ ___

        ___________ _________ ______
        __________ ______

        _ ______
    ____

    ____________ ______
____