import java.util.Scanner;
 
public class SumArray2
{
   public static void main(String[] args)
   {
      Scanner in = new Scanner(System.in);
      int n;
      double[] a;

      
      System.out.print("How many numbers in input: ");
      n = in.nextInt();                  // n = # values

      a = new double[n];      // Create an array of n elements
      int i;

      /* ------------------
         Read in the values
         ------------------ */
      for ( i = 0; i < a.length; i++ )
      {
         System.out.print("Enter a number: ");
         a[i] = in.nextDouble();            // Read in number
      }

      /* ------------------
         Compute the sum
         ------------------ */
      double sum;

      sum = 0.0;

      for ( i = 0; i < a.length; i++ )
      {
         sum = sum + a[i];    // Add a[i] to the running sum
                              // Common error: sum = a[i]
                              // This will store a[i] into sum
      }

      System.out.println( sum );
   }
}