def dfs(x, y, c):
    if c > 3:
        return
    if x == X and y == Y:
        print("YES")
        exit()
    dfs(x - 2, y - 1, c + 1)
    dfs(x - 2, y + 1, c + 1)
    dfs(x - 1, y - 2, c + 1)
    dfs(x - 1, y + 2, c + 1)
    dfs(x + 1, y - 2, c + 1)
    dfs(x + 1, y + 2, c + 1)
    dfs(x + 2, y - 1, c + 1)
    dfs(x + 2, y + 1, c + 1)

X, Y = map(int, input().split())
dfs(0, 0, 0)
print("NO")