import sys
input = sys.stdin.readline
sys.setrecursionlimit(10**6)
##############################

X, Y = map(int, input().split())
from collections import deque

def bfs(x, y, X, Y, i):

    d = deque()
    d.append((x, y, i))

    while d:
        (x, y, i) = d.popleft()

        if i == 3+1:
            return False
        if x == X and y == Y:
            return True

        d.append((x-2, y-1, i+1))
        d.append((x-2, y+1, i+1))
        d.append((x-1, y-2, i+1))
        d.append((x-1, y+2, i+1))
        d.append((x+1, y-2, i+1))
        d.append((x+1, y+2, i+1))
        d.append((x+2, y-1, i+1))
        d.append((x+2, y+1, i+1))


print('YES' if bfs(0,0,X,Y,0) else 'NO')