import sys
x = list(map(int, input().split()))
s = [0,0]
p = [[-2,-1],[-2,1],[-1,-2],[-1,2],[1,-2],[1,2],[2,-1],[2,1]]
for i in range(8):
    for j in range(8):
        for k in range(8):
            y = [s[0]+p[i][0]+p[j][0]+p[k][0],s[1]+p[i][1]+p[j][1]+p[k][1]]
            if y == x:
                print("YES")
                sys.exit()
print("NO")