def calc_knight_destinations(x: int, y: int) -> list[tuple[int, int]]:
    return [(x-2, y-1), (x-2, y+1), (x-1, y+2), (x+1, y+2),
            (x+2, y+1), (x+2, y-1), (x+1, y-2), (x-1, y-2)]


def main():
    X, Y = map(int, input().split())
    target = (X, Y)
    possible_destinations_1 = calc_knight_destinations(0, 0)
    possible_destinations_2 = []
    for current in possible_destinations_1:
        possible_destinations_2.extend(calc_knight_destinations(*current))

    possible_destinations_3 = []
    for current in possible_destinations_2:
        possible_destinations_3.extend(calc_knight_destinations(*current))

    if target in possible_destinations_1 or target in possible_destinations_2 or target in possible_destinations_3:
        print("YES")
    else:
        print("NO")


if __name__ == "__main__":
    main()