Problem Description

Takahashi has a rectangular parallelepiped with a height of $A\$, a width of $B\$, and a depth of $C\$. What is the surface area of this rectangular parallelepiped in $ cm^2 $?

Input Format

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

$ A $ $ B $ $ C $

Output Format

Output the surface area of this rectangular parallelepiped as an integer in one line.

Sample Input and Output

Sample Input #1

2 3 4

Sample Output #1

52

Sample Input #2

3 4 2

Sample Output #2

52

Sample Input #3

100 100 100

Sample Output #3

60000

Sample Input #4

1 1 1

Sample Output #4

6

Notes/Hints

Constraints

• $1\ ≦\ A,\ B,\ C\ ≦\ 100$
• All given numbers are integers.

见题面 Input 部分

见题面 Output 部分