#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std; #define REP(i,a,b) for(int i=a;i<(int)b;i++) #define rep(i,n) REP(i,0,n) #define all(c) (c).begin(), (c).end() #define zero(a) memset(a, 0, sizeof a) #define minus(a) memset(a, -1, sizeof a) template inline bool minimize(T1 &a, T2 b) { return b < a && (a = b, 1); } template inline bool maximize(T1 &a, T2 b) { return a < b && (a = b, 1); } typedef long long ll; int const inf = 1<<29; int main() { ll N; cin >> N; int foo = 0; for(int i=2; (ll)i*i<=N; i++) { while(N % i == 0) { N /= i; foo ++; } } if(N > 1) foo++; if(foo < 3) { cout << "NO\n"; } else { cout << "YES\n"; } return 0; }