import java.util.*;

class FinnSumError{
  public static void main(String[] args){
      if (args.length != 1) {
            System.out.println ("use: >java  FinnSumFeil n" );
    }else {
          int len = new Integer(args[0]).intValue();
          FinnSumError fs =new FinnSumError();

          for (int k = 0; k < 20; k++){
	      int [] arr = new int[len];
	      for (int i = 0; i < arr.length; i++){	arr[i] = i;	}

	long start  = System.nanoTime();
	long sum = fs.summer(arr);
	long timeTaken = System.nanoTime() - start ;

             //    System.out.printf(", SUM: %12d",  sum );
                System.out.printf(" %2d) sum of:%9d numbers  on :%10d nanosec%n",
                     (k+1), len,timeTaken);
   }}
} // end main

 long summer(int [] arr){
 	  long sum = 0;
 	  for(int i = 0; i < arr.length; i++)
 	        sum += arr[i];
             return sum;
   } } // end summer