#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std; #define ll long long #define ld long double #define EPS 0.0000000001 #define INF 1e9 #define LINF (ll)INF*INF #define MOD 1000000007 #define rep(i,n) for(int i=0;i<(n);i++) #define loop(i,a,n) for(int i=a;i<(n);i++) #define all(in) in.begin(),in.end() #define shosu(x) fixed< vi; typedef vector vs; typedef pair pii; typedef vector vp; int gcd(int a, int b){ if(b==0) return a; return gcd(b,a%b); } int lcm(int a, int b){ return a/gcd(a,b)*b; } vi factor(int n){ vi ret; for(int i = 2; i*i <= n; i++)if(n%i == 0){ ret.push_back(i); ret.push_back(n/i); } return ret; } bool prime(int n){ for(int i = 2; i*i <= n; i++)if(n%i == 0)return false; return true; } signed main(void) { int n; cin >> n; vi a = factor(n); rep(i,a.size())if(prime(a[i])){ cout << "YES" << endl; return 0; } cout << "NO" << endl; }