Problem Description

Score: $ 200 $ points

There is a cube with side length $ N $. One vertex of the cube is at $ (0,0,0) $, and all its edges are parallel to either the $ x $-axis, $ y $-axis, or $ z $-axis.

Also, for any point inside or on the surface of the cube, with coordinates $ (x,y,z) $, it satisfies $0 \leq x$ and $0 \leq y$ and $0 \leq z$.

This space is cut by the plane $\alpha$ which satisfies $ x+y+z=K $. Find the volume of the part of the cube that includes the point $ (0,0,0) $ after the cut, and output the value multiplied by $ 6 $. It can be shown that this value is an integer.

Input Format

The input is given from the standard input in the following format:

```
\(N\) \(K\)

## Output Format

Output the volume of the cut cube multiplied by $ 6 $ on one line.

Do not forget to add a newline at the end of the output.

## Sample Input and Output

### Sample Input #1

3 1

### Sample Output #1

1

### Sample Input #2

3 4

### Sample Output #2

61

### Sample Input #3

3 100

### Sample Output #3

162
```

Notes/Hints

None

见题面 Input 部分

见题面 Output 部分