import java.util.Scanner;
 
public class GetFibonacci {
    
    public static void main(String args[])
    {
 
        // Variables
        int NumberInputted;
        int previouspreviousNumber;
        int previousNumber = 0;
        int currentNumber = 1;
        
        // Print Out
        //System.out.println("Please enter an Integer number:");
 
        // Read In
        Scanner input = new Scanner(System.in);
        NumberInputted = input.nextInt();

        // Close Scanner
        input.close();
        
        // Get Fibonacci  
        for (int i = 1; i < NumberInputted ; i++) {

            previouspreviousNumber = previousNumber;
            previousNumber = currentNumber;
            currentNumber = previouspreviousNumber + previousNumber;
        }
            System.out.println("The Fib number is " + currentNumber);
    }
}