Q={(0,0)}
for tests in range(3):
    NQ=set(Q)
    while Q:
        x,y=Q.pop()
        for z,w in [(x-2,y-1),(x-2,y+1),(x-1,y-2),(x-1,y+2),(x+1,y-2),(x+1,y+2),(x+2,y-1),(x+2,y+1)]:
            NQ.add((z,w))
    Q=NQ
if tuple(map(int,input().split())) in Q:
    print("YES")
else:
    print("NO")