int total=0;
int n;

import static javax.swing.JOptionPane.*;
String input;
input = showInputDialog("Please enter a value for n, an integer:  ");
n=int(input);




//n = 6;

for ( int i = 1; i<=n; i=i+1){
  total = total + i;
}

println("The sum of the first",n,"natural numbers is",total);