#include <bits/stdc++.h>
#include <numeric>
#define REP(i, s, n) for (int i = s; i < n; ++i)
#define rep(i, n) REP(i, 0, n)
#define SORT(c) sort((c).begin(), (c).end())
#define SORT_INV(c) sort((c).begin(), (c).end(), greater<int>())
 
#define IINF INT_MAX
#define LLINF LLONG_MAX
#define DEBUG true
#define LL long long
#define Dev 1000000007
 
// sort(a.begin(), a.end(), std::greater<int>());
using namespace std;
 
int main()
{
   int n;
   cin>>n;
   if(n==3||n==5||n==7)
       cout << "YES" << endl;
       else{
           cout << "NO" << endl;
 
       }
       return 0;
}