// yukicoder: No.643 Two Operations No.2
// 2019.7.13 bal4u

#include <stdio.h>

#define SFT 500
#define MAX 1000
#define ABS(x) ((x)>=0?(x):-(x))
typedef struct { int x, y, s; } Q;
Q q[100000]; int top, end;
char vis[MAX+2][MAX+2];

int main()
{
	int x, y, s, ans = -1;

	scanf("%d%d", &x, &y);
	q[0].x = x, q[0].y = y, end = 1;
	while (top != end) {
		x = q[top].x, y = q[top].y, s = q[top++].s;
		if (x == y) { ans = s; break; }
		if (vis[SFT+x][SFT+y]) continue;
		vis[SFT+x][SFT+y] = 1;
		q[end].x = y, q[end].y = x, q[end++].s = s+1;
		if (ABS(x+y) <= SFT && ABS(x-y) <= SFT)
			q[end].x = x+y, q[end].y = x-y, q[end++].s = s+1;
	}
	printf("%d\n", ans);
	return 0;
}