# include<iostream> # include<cstdio> using namespace std; int main() { /* int n,p,k=0; cin>>n; p=n; while(p>=1) { k=k*10+p%10; p=p/10; } if(k==n) { cout<<"YES"<<endl; } else { cout<<"NO"<<endl; } */ int n,i,sum=0; cin>>n; for(i=1;i<n;i++) { if(n%i==0) { sum=sum+i; } } if(sum==n) { cout<<"YES"<<endl; } else { cout<<"NO"<<endl; } return 0; }