import javax.swing.JOptionPane;

/**
 * Compute the sum from 1 to an input integer.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Sum
{
	public void main(String[] args)
	{
	    int sum=0;
		String input = JOptionPane.showInputDialog("Please input a positive integer:");
		int max = Integer.parseInt(input);
		int data;
		data = max;
		
		while (data > 0) {
		    /* sum += data--; */
		       sum = sum + data;
		       data--; 
		       }
		       
	    System.out.println("The sum of the first " + max + " integers is " + sum);
	}
}