#include <bits/stdc++.h>
#define all(x) (x).begin(), (x).end()
typedef long long ll;
#define MOD 1000000007
using namespace std;
ll gcd(ll a, ll b) {
    if(a < b)
        gcd(b, a);
    ll r = 1;
    while(r != 0) {
        r = a % b;
        a = b;
        b = r;
    }
    return a;
}

int main() {
    ll a, b;
    cin >> a >> b;
    ll c = gcd(a, b);
    ll x = sqrt(c);
    cout << (x * x == c ? "Odd" : "Even") << endl;
}