Add

 import java.util.Scanner;

public class add
{

    public static void main( String[] args)
    {
    
        Scanner keyboard = new Scanner(System.in);
        
        System.out.println("What's your number: ");
        int num = keyboard.nextInt();
        int sum = 0;
        
        for ( int n = 1; n <= num; n = n+1)
        {
        System.out.print( n + " " );
                
        sum = sum + n;   
        }
            
        System.out.println();
        System.out.println( "The sum is " + sum );
        System.out.println();
    }
}
    

Picture of the output