import java.io.*;
import java.util.*;


public class PrintSum {

	private static Scanner openInput(String inputFileName) 
		throws FileNotFoundException {

		if (inputFileName == null)
			throw new IllegalArgumentException();

		File inputFile = new File(inputFileName);
		return new Scanner(inputFile);	
	}

	private static Formatter openOutput(String outputFileName)
		throws FileNotFoundException {

		if (outputFileName == null)
			throw new IllegalArgumentException();
		
		File outputFile = new File(outputFileName);
		return new Formatter(outputFile);
	}

	public static void main(String[] args) {
		try {
			Scanner input = openInput(args[0]);
			Formatter output = openOutput(args[1]);

			int sum = 0;
			while (input.hasNextInt()) {
				sum += input.nextInt();
			}

			System.out.format("sum = %d", sum);
			output.format("sum = %d", sum);

			input.close();
			output.close();
		}
		catch (FileNotFoundException e) {
			System.out.println("Couldn't open file: " + e);
		}
		catch (Exception e2) {
			System.out.println("Something bad happened: " + e2);
		}
	}

}