#line 2 "/home/cocojapanpan/Procon_CPP/proconLibrary/lib/template/procon.hpp" #ifndef DEBUG // 提出時にassertはオフ #ifndef NDEBUG #define NDEBUG #endif // 定数倍高速化 #pragma GCC target("avx2") #pragma GCC optimize("O3") #pragma GCC optimize("unroll-loops") #endif #include <bits/stdc++.h> using namespace std; using ll = long long; using i64 = long long; using u64 = unsigned long long; #define ALL(x) (x).begin(), (x).end() template <class T> using vec = vector<T>; template <class T, class S> inline bool chmax(T &a, const S &b) { return (a < b ? a = b, 1 : 0); } template <class T, class S> inline bool chmin(T &a, const S &b) { return (a > b ? a = b, 1 : 0); } template <class T> constexpr T INF = 1'000'000'000; template <> constexpr int INF<int> = 1'000'000'000; template <> constexpr ll INF<ll> = ll(INF<int>) * INF<int> * 2; #line 2 "main.cpp" int main() { ios_base::sync_with_stdio(false); cin.tie(nullptr); ll N; cin >> N; int cnt = 0; for(ll i = 2; i <= 1000'000; i++) { if(N == 1) break; if(N % i == 0) { ++cnt; } while(N % i == 0) { N /= i; } } if(N > 1) { ++cnt; } cout << (cnt <= 2 ? "Yes" : "No") << "\n"; }