dupa

import java.util.Scanner;
import java.util.*;
public class Program


{
	public static void main(String [] args)
	{
		int wrt1, wrt2; double wrt3;
		/*Scanner konsola= new Scanner(System.in);
		wrt1=konsola.nextInt();
		wrt2=(int)(Math.random()*100);
		System.out.println(wrt2);
		System.out.println("wrt1*wrt2= "+wrt1*wrt2);
		*///wrt2=fibbonaci(wrt1);
				//		System.out.println(wrt2);
		Scanner konsola= new Scanner(System.in);
		wrt1=konsola.nextInt();
				System.out.println(fibbonaci(wrt1));

	}
	static int fibbonaci(int wrt)
		{ 	System.out.println("fib "+wrt);
			if(wrt==1)
			{
				return 1;
			}
			else
			{if(wrt==2)
				return 1;
			else				return (fibbonaci(wrt-1)+fibbonaci(wrt-2));
			}


		}
}