#include<iostream> #include<cstdio> //scanf()\printf() #include<cstring> #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int n,s=0; cin>>n; for(int i=1;i<n;i++){ if(n%i==0) s+=i; } if(s==n){ cout<<"YES"; } else{ cout<<"NO"; } return 0; }