S = 1 + (1+2) + (1+2+3) …………To n

import java.util.*;

class sum_series
{
    public static void main(String args[])
    {
        int s=0,n,t=0;
        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;
        t=t+s;
        }
        System.out.println("SUM="+t);
      
       
    }
}