#include <bits/stdc++.h>
using namespace std;
using ll=long long;
int main(){
	ll N;
	cin>>N;
	ll count=0;
	ll zero=0;
	for(ll i=1;i<=pow(N,0.5);i++){
		if(N%i==zero){
			if(i==pow(N,0.5)){
			  count+=pow(N,0.5);
			}else{
			  count+=N/i+i;
			}
		}
	}
	
  if(count==2*N){
    cout<<"Yes";
  }else{
    cout<<"No";
  }
  
}