#include <bits/stdc++.h>

using ll = long long;

using namespace std;

ll gcd(ll a, ll b)
{
    if (a == 1 || b == 1)
        return 1;

    ll m{ a }, n{ b };

    while (m != n)
        m > n ? m -= n : n -= m;

    return m;
}

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

    return ok * ok == x;
}

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

    ll a, b;

    scanf("%lld%lld", &a, &b);

    ll g = gcd(a, b);

    printf("%s", isSquare(g) ? "Odd\n": "Even\n");

    return 0;
}