#include <stdio.h>

int odd(int n)
{
	printf("odd  %d called\n", n);
	if (n == 1)
		return 1;
	return even(n - 1);
}

int even(int n)
{
	printf("even %d called\n", n);
	if (n == 1)
		return 0;
	return odd(n - 1);
}

int main()
{
	int n;
	scanf("%d", &n);
	if (n <= 0)
	{
		printf("%d must be a positive integer\n");
		return -1;
	}
	if (odd(n))	// odd(n) == 1
		printf("%d is odd\n", n);
	else
		printf("%d is even\n", n);
}