X, Y = map(int, input().split())

def idou(p,t):
    if t == 3:
        return "NO"
    ret = []
    for q in p:
        x = q[0]
        y = q[1]
        ret.extend([[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]])
    if [X,Y] in ret:
        return "YES"
    else:
        return idou(ret,t+1)

print(idou([[0,0]],0))