#include <iostream>
using namespace std;
int main() {
int n;
cin>>n;
int t=0;
for (int i=1;i<=n/2;++i) {
if (n%i==0) {
t+=i;
}
}
if (t==n) {
cout<<"YES"<<endl;
} else {
cout<<"NO"<<endl;
}
return 0;
}

#include <bits/stdc++.h>
#define pii pair<ll,ll>
#define endl '\n'
#define name "uprage"
#define in freopen(name".inp","r",stdin)
#define out freopen(name".out","w",stdout)
#define pb push_back
#define fast ios_base::sync_with_stdio(false); cin.tie(NULL);
#define fi first
#define se second
#define mp make_pair
#define reset(a) memset(a,0,sizeof(a))
#define mod int(1e5)
#define nmax 10000009
using namespace std;
typedef long long ll;
typedef double long dl;

int a[nmax], b[nmax];
int main()
{
    freopen("HOHA2.inp", "r", stdin);
    freopen("HOHA2.out", "w", stdout);
    ll n;
    cin >> n;
    ll s = 0;
    ll t = sqrt(n);
    for(int i = 1; i <= t; i++)if(n % i == 0)s += i + (n/i);
    if(t * t == n)s -= t;
    if(s ==  n)cout << "YES";
    else cout << "NO";

}