#include<bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define RFOR(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define REP(i,n) for (int i=0;i<(n);i++)
#define RREP(i,n) for (int i=(n)-1;i>=0;i--)
typedef long long LL;
LL N;
int main(){
    cin>>N;
    /*
    LL a=0;
    for(int i=0;i<N;i++){
        a=(a^(i+1));
        //cout<<a<<endl;
        if((i+2)%4==0){
           if(a!=0){
              cout<<a<<"Miss"<<i+2<<endl;
           }
        }else{
           if(a==0){
              cout<<"Bizz"<<i+1<<endl;
           }
        }
    }
    cout<<a<<endl;
    */
    if((N+1)%4==0){
       cout<<"X"<<endl;
    }else{
       cout<<"O"<<endl;
    }
    return(0);
}