Sum of squares of even numbers from 1 to N

PHP Easy loops

Task «Sum of squares of even numbers from 1 to N»

Write a program that takes a positive integer N and calculates the sum of squares of all even numbers from 1 to N inclusive. If N is less than 1, output 0. Use a for or while loop.

Input Format

Integer N, entered on a new line.

Output Format

An integer is the sum of squares of even numbers from 1 to N.

Examples

Example 1

INPUT

10

OUTPUT

220

Example 2

INPUT

1

OUTPUT

0

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