ans = []
def reach(x, y, n):
 
    if n < 0:
        return ans

    ans.append((x, y))
    reach(x-2, y-1, n-1)
    reach(x-2, y+1, n-1)
    reach(x-1, y-2, n-1)
    reach(x-1, y+2, n-1)
    reach(x+1, y-2, n-1)
    reach(x+1, y+2, n-1)
    reach(x+2, y-1, n-1)
    reach(x+2, y+1, n-1)
    
xg, yg = map(int, input().split())
reach(0, 0, 3)

if (xg, yg) in ans:
    print("YES")
else:
    print("NO")