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

int main(){
    int64_t A, B;
    cin >> A >> B;
    auto G = gcd(A, B);
    int64_t ok = 1, ng = 1e9+1;
    while(ng-ok>1){
        int64_t mid = (ng+ok)/2;
        (mid*mid <= G ? ok : ng) = mid;
    }
    cout << (ok*ok == G ? "Odd" : "Even") << endl;
    return 0;
}