题解

#include<bits/stdc++.h>
using namespace std;

int f(int n,int n1){
    if(n == 0){
        n1 /= 10;
        return n1;
    } else {
        return f(n / 8,(n1 + n % 8) * 10);
    }
}

int g(int n,int n1){
    if(n == 0){
        n1 /= 10;
        return n1;
    } else {
        g(n / 10,(n1 + n % 10) * 10);
    }
}

int main(){
    int n,n1 = 0;
    cin >> n;
    n1 = f(n,0);
    if(g(n1,0) == n1){
        cout << "YES";
    } else {
        cout << "NO";
    }
    return 0;
}