import java.util.Scanner;

/**
 * ClassName: HomeWork
 *
 * @Author 爱扣钉-陈晨
 * @Create 2023/11/4 9:19
 * @Version 1.0
 */
public class Exer05 {
    public static void main(String[] args) {
        //判断1-100之间,有多少个7.

        int count = 0;
        for (int i = 1; i < 100; i++) {
            if ( i % 10 == 7 ){
                count++;
            }
            if ( i / 10 == 7 ){
                count++;
            }
        }
        System.out.println(count);


        //输出一个三位数的水仙花数字.
        for (int i = 100; i < 999 ; i++) {
            //个位十位百位
            int g = i % 10;
            int s = i / 10 % 10;
            int b = i / 100;

            if (i == g*g*g + s*s*s + b*b*b){
                System.out.println(i);
            }
        }
    }
}