#include<stdio.h>
int abs(int n)
{
	if (n < 0)
		n *= -1;
	return n;
}
int main()
{
	int a, b;
	scanf("%d %d", &a, &b);
	if (a < b)
	{
		a ^= b;
		b ^= a;
		a ^= b;
	}
	int c1, c2;
	c2 = a - b;
	c1 = 2 * b;
	int i, ans = abs(c1 - c2);
	for (i = 1; i < b; i++)
	{
		c1 -= 2;
		c2 += 2;
		if (ans > abs(c1 - c2))
			ans = abs(c1 - c2);
	}
	printf("%d\n", ans);
	return 0;
}