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

int main() {
    ll a, b;
    cin >> a >> b;
    ll g = gcd(a, b);
    ll s = sqrt(g);
    if (s * s == g) cout << "Odd" << endl;
    else cout << "Even" << endl;
    return 0;
}