x,y = map(int,input().split())
z = [(0,0),(0,1),(0,2),(0,3),(1,0),(1,1),(1,2),(2,0),(2,1),(3,0)]
res = "NG"
if abs(x) > 6 or abs(y) > 6 :
    res = "NO"
else :
    for i in range(len(z)) :
        m,n = z[i]
        if 2*m + n == abs(x) and m + 2*n == abs(y):
            res = "YES"
            break
print(res)