C :

#include<stdio.h>
int main()
{
	int n,i,s=0,t=0;
	scanf("%d",&n);
    for(i=1;i<=n;i++)
	{
		
		t=t+i;
		
		s=s+t;
	}
	printf("%d\n",s);
	return 0;
}

C++ :

#include<stdio.h>
int main()
{
    int n,i,s=0,sum=0;
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
        s=s+i;
        sum=sum+s;
    }
    printf("%d",sum);
    return 0;
}

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 sum =0;
        for (int i = 1; i <= n; i++){
            sum+=Sum(i);
        }
        System.out.println(sum);
    }
    public static int Sum(int n){
        return (1+n)*n/2;
    }
}

Python :

# coding=utf-8
#!/usr/bin/python2
import sys
import re
import math
 


n=int(input())
sum=0
for i in range(1,n+1):
    for k in range(1,i+1):
        sum=sum+k
        
        
print sum

C# :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp2
{
    internal class Program
    {
        static void Main()
        {
           
            int sum = 0;
          
            int n = Convert.ToInt32(Console.ReadLine());

            for (int i = 1; i <= n; i++)
            {
                for (int j = 1; j <= i; j++)
                {
                    sum = sum + j;
                }
            }
            Console.WriteLine(sum); 
            Console.ReadKey();
     
        }
    }
}