#pragma region include
#include <iostream>
#include <iomanip>
#include <stdio.h>

#include <sstream>
#include <algorithm>
#include <cmath>
#include <complex>

#include <string>
#include <cstring>
#include <vector>
#include <tuple>
#include <bitset>

#include <queue>
#include <complex>
#include <set>
#include <map>
#include <stack>
#include <list>

#include <fstream>
#include <random>
//#include <time.h>
#include <ctime>
#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;
	int orgN = N;//元の余る予定の数
	++N;
	
	//0-indexからペアにしてxor,1ビットしか残らない
	int ans = (N/2);//1の個数
	int bit1 = (ans)%2;//奇数なら1残る,偶数なら0
	
	if( (N%2) != 0 ){//余る
		if( (orgN^bit1) != 0){
			cout << "O" << endl;//自分が勝つ
		}else{//==0
			cout << "X" << endl; //チワワが勝つ			
		}
		return;
	}
	
	if( bit1 != 0 ){
		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()