#include<stdio.h>
long long int gcd(long long int a, long long int b)
{
	long long int r = a % b;
	while (r > 0)
	{
		a = b;
		b = r;
		r = a % b;
	}
	return b;
}
long long int sqrt(long long int n)
{
	long long int min, mid, max;
	min = 0;
	max = 1;
	while (max * max <= n)
		max *= 2;
	while (max - min > 1)
	{
		mid = (max + min) / 2;
		if (mid * mid <= n)
			min = mid;
		else
			max = mid;
	}
	return min;
}
int main()
{
	long long int a, b;
	scanf("%lld %lld", &a, &b);
	long long int g = gcd(a, b);
	long long int r = sqrt(g);
	if (r * r == g)
		printf("Odd\n");
	else
		printf("Even\n");
	return 0;
}