dx = [-2,-2,-1,-1,1,1,2,2]
dy = [-1,1,-2,2,-2,2,-1,1]


nyrn = set()
q = [(0,0,0)]
while q:
    x,y,c = q.pop(0)
    nyrn.add((x,y))
    if c > 2:
        continue
    for i in range(8):
        q.append((x+dx[i],y+dy[i],c+1))

X,Y = map(int,raw_input().split(" "))
print "YES" if (X,Y) in nyrn else "NO"