9671: ABC184 —— A - Determinant
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Description
Given is a $2 \times 2$ matrix $A = \begin{bmatrix} a & b \\ c & d \end{bmatrix}$.
The determinant of $A$ can be found as $ad-bc$.
Find it.
The determinant of $A$ can be found as $ad-bc$.
Find it.
Input
Input is given from Standard Input in the following format:
```
$a$ $b$
$c$ $d$
```
```
$a$ $b$
$c$ $d$
```
Output
Print the answer as an integer.
Constraints
- All values in input are integers.
- $-100 \le a, b, c, d \le 100$
- $-100 \le a, b, c, d \le 100$
Sample 1 Input
1 2
3 4
Sample 1 Output
-2
The determinant of $\begin{bmatrix} 1 & 2 \\ 3 & 4 \end{bmatrix}=−21×4−2×3=−2$.
Sample 2 Input
0 -1
1 0
Sample 2 Output
1
Sample 3 Input
100 100
100 100
Sample 3 Output
0