非常简单

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

int main()
{
    int n;
    cin >> n;
    int a=n/100,b=n/10%10,c=n%10;
    if (a*a*a+b*b*b+c*c*c==n)
        cout << "YES";
    else
        cout << "NO";
    return 0;
}