#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define ALL(v) v.begin(), v.end()
typedef long long ll;

#include <bits/stdc++.h>
using namespace std;

int main() {
  ll n;
  cin>>n;
  
  ll m=sqrt(n);
  
  if(m*m==n) cout<<"Odd"<<endl;
  else cout<<"Even"<<endl;
    
  return 0;
}