//
//	counter-ctrl loop
//  Page 076
//

import java.util.Scanner;
class Prog_6_2m
{
	public static void main(String[] args)
	{
			Scanner input = new Scanner(System.in);
			int count = 0;	// setup the counter
			int data;			// used to hold data
			int sum = 0;		//  sum = data1 + data2 + ...
			while (count < 5)
			{
				data = input.nextInt();
				sum = sum + data;	// or sum += data;
				count ++;
			}
			System.out.println("sum = " + sum);
	}
}