Determinant

题目描述

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.

输入格式

Input is given from Standard Input in the following format: $a$ $b$ $c$ $d$

输出格式

Print the answer as an integer.

1 2
3 4

-2

0 -1
1 0

1

100 100
100 100

0

提示

All values in input are integers. $-100 \le a, b, c, d \le 100$The determinant of $\begin{bmatrix} 1 & 2 \\ 3 & 4 \end{bmatrix}$ is $1 \times 4 - 2 \times 3 = -2$.

标签: AtCoder|abc184A

来源

AtCoder|abc184A