#pragma region include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include //#include #include #pragma endregion //#include ///////// #define REP(i, x, n) for(int i = x; i < n; ++i) #define rep(i,n) REP(i,0,n) ///////// #pragma region typedef typedef long long LL; typedef long double LD; typedef unsigned long long ULL; #pragma endregion //typedef ////定数 const int INF = (int)1e9; const LL MOD = (LL)1e9+7; const LL LINF = (LL)1e18; const double PI = acos(-1.0); const double EPS = 1e-9; ///////// using namespace::std; void solve(){ int N; cin >> N; LL ans = 1; for(int i=2;i<=N;++i){ ans ^= i; } if( ans ){ cout << "O" << endl;//自分が勝つ }else{ cout << "X" << endl; //チワワが勝つ } } #pragma region main signed main(void){ std::cin.tie(0); std::ios::sync_with_stdio(false); std::cout << std::fixed;//小数を10進数表示 cout << setprecision(16);//小数点以下の桁数を指定//coutとcerrで別 solve(); } #pragma endregion //main()