series

package Factorial;

import java.util.Scanner;

public class series {
    public static void main(String[] args) {
        Scanner ss= new Scanner(System.in);
        int n=ss.nextInt();
        int sum=0;
        for (int i = 1; i <= n; i+=2) {
            sum+=i*i;
        }
        System.out.println("sum is = "+sum);
    }
}