#include <bits/stdc++.h>
using namespace std;
using ll = long long;

/*

Happy birthday!!!!
＼(^o^)／

*/

ll yk(ll n){
    ll y = 0;
    for(ll i = 1; i * i <= n; ++i){
        if(n%i != 0) continue;
        y += i;
        if(n/i != i) y += (n/i);
    }
    return y;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    ll n; cin >> n;
    ll z = yk(n);
    if(z == 2*n) cout << "Yes" << '\n';
    else cout << "No" << '\n';
    return 0;
}