S = {(0,0)}
D = [(2,1),(1,2),(-1,2),(-2,1),(-2,-1),(-1,-2),(1,-2),(2,-1)]

for i in range(3):
    for x,y in list(S):
        for dx,dy in D:
            S.add((x+dx,y+dy))

X,Y = map(int,input().split())
if (X,Y) in S:
    print("YES")
else:
    print("NO")