#include <bits/stdc++.h>

using namespace std;

#define REP(i, n) for (int i = 0; i < n; i++)
#define FOR(i, m, n) for (int i = m; i < n; i++)
#define ALL(obj) obj.begin(), obj.end()
#define Size(obj) (int)obj.size()
#define fcout cout << fixed

using i64 = long long;

const int iINF = INT_MAX;

i64 gcd(i64 a, i64 b) {
    if (a < b) {
        return gcd(b, a);
    } else if (b == 0) {
        return a;
    } else {
        return gcd(b, a % b);
    }
}

int main() {
    i64 n;
    cin >> n;

    cout << (n % 4 != 3 ? "O" : "X") << endl;

    return 0;
}