#ifndef LOCAL
#include <bits/stdc++.h>

using namespace std;

#define debug(...) (void(0))
#else
#include "algo/debug.h"
#endif

void solve() {
    int64_t A, B; cin >> A >> B;
    int64_t g = std::gcd(A, B);
    int64_t sq = std::sqrt(g);
    cout << (sq * sq == g ? "Odd" : "Even") << endl;
}

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int tt = 1;
    // std::cin >> tt;
    while (tt--) {
        solve();
    }
}