A. Fun with Food Audits
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output

Environmentalist Eve wants to find out the total food waste at her school during lunch every day. There are four trash cans around the campus where students can discard food, with each weighing six pounds when empty. At the end of the lunch period, Eve weighs (in pounds) how heavy each trash can is.

Help Eve calculate how much food (in pounds) is wasted during that lunch.

Input

Line 1: Four space-separated integers, the weights of the four trash cans

Output

Line 1: The total food waste (in pounds)

Example
Input
18 10 9 25
Output
38
Note

1 $$$\le$$$ Weight of each trash can $$$\le$$$ 500