import java.util.Scanner;

public class funcs {
    static Scanner scanner = new Scanner(System.in);

    static int fibonachchi(int x) {
        int r = 1;
        int a = 0;
        int b = 1;
        for (int i = 1; i < x; i++) {
            r = a+b;
            a=b;
            b=r;

        }
        return r;
    }
    public static void main(String[] args) {
        System.out.println("Введите число ");
        int n = scanner.nextInt();
        int j;
         j = fibonachchi(n);

        System.out.println(j);
    }
}