#include <bits/stdc++.h>

using namespace std;

using ll = long long;

constexpr char newl = '\n';

const ll MOD = 1000000007;

bool isSquare(ll x) {
    __int128_t ng = 0, ok = x;
    while (ok - ng > 1) {
        __int128_t mid = (ng + ok) / 2;
        (mid * mid >= x ? ok : ng) = mid;
    }
    return ok * ok == x;
}

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

    ll a, b;
    cin >> a >> b;

    ll g = __gcd(a, b);
    cout << (isSquare(g) ? "Odd" : "Even") << newl;

    return 0;
}