#include #include #include #include #include #include #include #define rep(i, n) for(i = 0; i < (n); i++) #define chmax(x, y) x = max(x, y) #define chmin(x, y) x = min(x, y) #define MOD 1000000007 #define PI 3.14159265358979323846 #define INF 1 << 30 using namespace std; typedef long long ll; typedef pair pp; int main(void) { int i, k = 1; ll num, a; cin >> num; for (i = 2; i <= sqrt(num); i++) { while (num % i == 0) { num /= i; k++; a = i; } } if (k <= 2 || a * a == num) printf("NO\n"); else printf("YES\n"); return 0; }