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Main.c

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#include <iostream>

using namespace std;
 
int main()
{
 long long int a, b, c, n;
 cin>> n;
 
 c = 0;
 
 for(int i =1; i!=n; i++)
 {
 if(n % i == 0)
 {
 c += i;
 }
 }
 
 if(c == n)
 {
 cout <<"YES";
 }
 
 else
 {
 cout<<"NO";
 }
 
 
 return 0;
}