Sum of Consecutive Even Numbers

Source: beecrowd

Version: Phuoc Hung OJ Extended

Problem Statement

Given positive X, sum the first five consecutive even integers beginning at the smallest even integer greater than or equal to X.

Input

One positive integer X. This version handles one value; do not append the original 0 sentinel.

Output

Print the sum of the five even integers.

Subtasks

• Subtask 1 (20%): 1 ≤ X ≤ 20.

• Subtask 2 (30%): 1 ≤ X ≤ 1000.

• Subtask 3 (50%): 1 ≤ X ≤ 10^9.

Examples

Example 1

Input:

4

Output:

40

Explanation: The numbers 4, 6, 8, 10, 12 sum to 40.

Example 2

Input:

7

Output:

60

Explanation: The numbers 8, 10, 12, 14, 16 sum to 60.