动态规划公式: feiBo[i] = feiBo[i - 1] + feiBo[i - 2];

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextInt()) { // 注意 while 处理多个 case
            int a = in.nextInt();


            int[] feiBo = new int[a];
            feiBo[0] = 1;
            feiBo[1] = 1;

            for (int i = 2; i < a; i++) {
                feiBo[i] = feiBo[i - 1] + feiBo[i - 2];
            }
            System.out.println(feiBo[a - 1]);

        }
    }
}