def rook_moves(gx, gy):
    if gx == 0 and gy == 0:
        return 0
    if gx == 0 or gy == 0:
        return 1
    return 2

def bishop_moves(gx, gy):
    if (gx + gy) % 2 != 0:
        return float('inf')  # không thể đến được
    if gx == 0 and gy == 0:
        return 0
    if abs(gx) == abs(gy):
        return 1
    return 2

def main():
    gx, gy = map(int, input().split())
    ans = min(rook_moves(gx, gy), bishop_moves(gx, gy))
    print(ans)

if __name__ == "__main__":
    main()