Morning Walk Distance

                                                                 Morning Walk Distance

A man in order to reduce his weight walks along the boundary of a rectangular plot every morning. Depending on his energy level he walks for N rounds on a given day.

Given the length L and breadth B of the rectangular plot along with the number of rounds N, the program must print the total distance D covered in the morning walk.

Note: Do not worry about the units like meters or kilometers.

Input Format:
The first line contains L and B separated by a space.
The second line contains N.

Output Format:
The first line contains D.

Boundary Conditions:
1 <= N <= 100
1 <= L, B <= 999999

Example Input/Output 1:
Input:
10 20
5

Output:

300     

C Program:

#include<stdio.h>
#include <stdlib.h>

int main()
{
int a,b,c;
scanf("%d%d%d",&a,&b,&c);
printf("%d",2*(a+b)*c);

}