#include <iostream>
#include <cstdint>

using namespace std;

template<typename T1, typename T2> constexpr decltype((T1)1 % (T2)1) GCD(const T1 a, const T2 b) noexcept
{
	decltype((T1)1 % (T2)1) x = a, y = b, z = 0;
	while (y != 0) z = x % y, x = y, y = z;
	return x;
}

template<typename T1, typename T2> constexpr bool is_squared(const T1 target, T2 l, T2 r) noexcept
{
	while (l < r)
	{
		const T2 c = l + (r - l) / 2;
		const decltype((T1)1 * (T2)1) c_squared = static_cast<decltype((T1)1 * (T2)1)>(c) * c;
		if (c_squared < target) l = c + 1;
		else if (c_squared != target) r = c;
		else return true;
	}
	return false;
}

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

	uint64_t A, B;
	cin >> A >> B;

	if (is_squared(GCD(A, B), 1, 1'000'000'001)) cout << "Odd\n";
	else cout << "Even\n";

	return 0;
}