#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c,d;
	cin>>d;
	a=d/100;
	b=d/10%10;
	c=d%10;
	if(a*a*a+b*b*b+c*c*c==d){
		cout<<"yes";
	}else cout<<"no"; 
}
/**************************************************************
	Problem: 1671
	User: panyuchen
	Language: C++
	Result: Wrong Answer
****************************************************************/