#include<bits/stdc++.h>
#define rep(i,n) for(long long (i) = (0);(i) < (n);(i)++)
#define reps(i,m,n) for(long long (i) = (m);(i) < (n);(i)++)
#define rep2(i,n) for(long long (i) = (1);(i) <= (n);(i)++)
#define reps2(i,m,n) for(long long (i) = (m);(i) <= (n);(i)++)
#define rrep(i,n) for(long long (i) = (n) - (1);(i) >= (0);(i)--)
#define rreps(i,m,n) for(long long (i) = (n) - (1);(i) >= (m);(i)--)
#define rrep2(i,n) for(long long (i) = (n);(i) >= (0);(i)--)
#define rreps2(i,m,n) for(long long (i) = (n);(i) >= (m);(i)--)
#define MAX_N LLONG_MAX
#define MIN_N LLONG_MIN
#define mod 998244353
#define MOD 1000000007

using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
using P = pair<ll,ll>;

template<typename T>
bool chmax(T a,const T &b){if(a < b){a = b;return true;}else return false;}
template<typename T>
bool chmin(T a,const T &b){if(a > b){a = b;return true;}else return false;}

int main(){
    int n;
    cin >> n;
    cout << (n % 4 != 3 ? "O" : "X") << endl;
    return 0;
}