l = [(-2,-1),(-2,1),(-1,-2),(-1,2),(1,-2),(1,2),(2,-1),(2,1)]
ansl = []

for li in l:
    ansl.append(li)
    for lli in l:
        ansl.append((li[0]+lli[0],li[1]+lli[1]))
        for llli in l:
            ansl.append((li[0]+lli[0]+llli[0],li[1]+lli[1]+llli[1]))
# print(ansl)
x, y = map(int,input().split())
if (x, y) in ansl:
    print("YES")
else:
    print("NO")