class SumIntLooping
{

   static final int N = 6 ;

   public static
   void main( String [] args )
   {
      int sum = 0 ;
      int i = 1 ;
      while ( i<N )
      {
          sum = sum + i ; // update
          i++ ; // move along ...
      }
      System.out.println(sum) ;
  }
}