S = (1*2) + (2*3) + ……… To n

import java.util.*;
class sum_series
{
    public static void main(String args[])
    {
        int s=0,n,j=2;
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter the value of n");
        n=sc.nextInt();
        for(int i=1;i<n;i++)
        {      
        s=s+(i*j);
        j++;
        }
        System.out.println("SUM="+s);
      
       
    }
}