code/old_homework/homework_2025.1.11.cpp

#include<iostream>
using namespace std;

int main(){
    int n,sum=0;
    cin >> n;
    for (int i = 1; i <= n / 2; i++)
    {
        if (n % i == 0)
        {
            sum += i;
        }
    }

    if (sum == n)
    {
        cout << "YES" << endl;
    }
    else
    {
        cout << "NO" << endl;
    }
    
    return 0;
}