//
//	Q4: code will sum up all the data in file?
//

import java.util.Scanner;

class Review4
{
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);

		int sum = 0;

		while(input.hasNextInt())
			sum += input.nextInt();

		System.out.println("sum = " + sum);

		System.out.println("\n\n\n");
	}
}