#include #include #include #include #include #include #include #include #include #include #include #include #include #include using ll = long long; using namespace std; typedef unsigned long long ull; typedef pairP; ll gcd(ll a, ll b) { if (b == 0) return a; return gcd(b, a%b); } ll lcm(ll a, ll b) { ll g = gcd(a, b); return a / g * b; } const ll mod = 1000000007; const ll INF = 1 << 30; const ll INF2 = 9000000000000000000LL; bool fl = true; int dx[4] = { 1,0,-1,0 }, dy[4] = { 0,1,0,-1 }; string abc = "abcdefghijklmnopqrstuvwxyz"; struct edge { ll to, cost; }; struct edge1 { ll from, to, cost; }; double pai = 3.141592653589793; int main() { ll n; cin >> n; if (n % 4 == 3)cout << 'X' << endl; else cout << 'O' << endl; }