水仙花数！！！

#include<iostream> 
using namespace std;
int main()
{
	int a,b,c,n;
	cin>>n;
	a=n/100;
	b=n/10%10;
	c=n%10;
	if(a*a*a+b*b*b+c*c*c==n)
		cout<<"yes"<<endl;
	else
		cout<<"no";
	return 0;
}