#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

template<typename S,typename T,typename U>void flagfunc1(S flag,T A,U B){flag?cout<<A<<'\n':cout<<B<<'\n';}

ll gcd(ll a, ll b) { return b?gcd(b,a%b):a;}

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);

  ll a,b;cin>>a>>b;
  ll c=gcd(a,b);
  ll d=sqrt(c);
  flagfunc1(d*d==c,"Odd","Even");
}