//File:	Sum.java
import CSLib.*;
public class Sum
{
	public static void main (String [] args)
	{
		int 	sum = 0;
			
		InputBox in = new InputBox("Summing");
		in.setPrompt("I will sum the integers from 1 to ?");
		int n = in.readInt();
		
		for (int count=1; count<=n; count++)
		{
			sum = sum + count;
		}
		
		OutputBox out = new OutputBox("1 + 2 + ... + n");
		out.setSize(300, 100);
		out.println ("1 + 2 + ... + " + n + " = " + sum);
	}
}