C++ :

#include <bits/stdc++.h>
using namespace std;
int main(){
	int i,n,m=0;
	int s=0;
	cin>>n;
	for(i=1;i<=n-1;i++){
		s=(n-i)*(n-i)*i;
		if(s>m){
			m=s;
		}
	}
	cout<<m<<endl;
}

Java :

import java.util.Scanner;
public class Main
{
    public static void main(String[] args){
       Scanner sc = new Scanner(System.in);
       int n= sc.nextInt();
       int s;       
       int sss = 0;
       for(int m=1;2*m<n;m++) {   
    	  s=(n-2*m)*(n-2*m)*m;
    	  if(sss<s) 
    	  {
    		  sss = s;}
       }
 	  System.out.println(sss);
       }
}

Python :

n = int(input())
y = []
for i in range(1, n // 2 + 1):
    x = (n - (i * 2)) * (n - (i * 2)) * i
    y.append(x)
print(max(y))