#include<iostream> #include<cstdio> #include<cstring> #include<cmath> using namespace std; int main(){ int n,s=0; cin>>n; for(int i=n-1;i>=1;i--){ if(n%i==0){ s=s+i; } } if(n==s) cout<<"YES"<<endl; else cout<<"NO"<<endl; return 0; }