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#include <bits/stdc++.h>
using namespace std;
bool f(long long a)
{
long long b=1;
for (long long i=2; i*i<=a; ++i)
{
if (a%i==0)
{
b+=i;
b+=a/i;
}
}
if (b==a&&b!=1)
{
return true;
}
return false;
}
int main ()
{
long long n;
cin >> n;
if (f(n))
{
cout << "yes" << endl;
return 0;
}
cout << "no" << endl;
return 0;
}