from queue import Queue
X,Y = map(int, input().split())
dx = [-2, -2, -1, -1, 1, 1, 2, 2]
dy = [-1, 1, -2, 2, -2, 2, -1, 1]

que = Queue()
que.put((0, 0, 0))
import sys
while (not que.empty()):
    pos = que.get()
    if (int(pos[0]) == X and int(pos[1]) == Y):
        print ("YES")
        sys.exit(0)
        break
    if (int(pos[2]) > 2):
        continue
    for k in range(len(dx)):
        ny = pos[0] + dy[k]
        nx = pos[1] + dx[k]
        que.put((ny, nx, int(pos[2]) + 1))
        
print ("NO")