题解 | #自守数#

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 scanner = new Scanner(System.in);
        while(scanner.hasNextInt()){
            int input = scanner.nextInt();
            if(input == 0){
                System.out.println(1);
                continue;
            }
            int count = 0;
            for(int i=0; i<=input; i++){
                int result = (int) Math.pow(i, 2);
                if(String.valueOf(result).endsWith(String.valueOf(i))){
                    count++;
                }
            }
            System.out.println(count);
        }
    }
}