ProgBasicsJavaBook7.1ComplexLoop14fibonacci

import java.util.Scanner;

public class E14fibonacci {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int n = Integer.parseInt(scanner.nextLine());
        int f0 = 1;
        int f1 = 1;

        for (int i = 0; i < n - 1; i++) {
            int nF = f0 + f1;
            f0 = f1;
            f1 = nF;
        }
        System.out.println(f1);


    }
}