/**
 * Calculate sum of 1..n using a for loop (no threading)
 */
public class SumV1
{
  public static void main( String[] args )
  {
    int n = 1000000;
    long sum = 0L;
    for ( int i = 1 ; i <= n ; i++ ) {
      sum += i;
    }
    System.out.println( "SUM 1.." + n + " IS " + sum );
  }
}