import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.Scanner;
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception {
		Scanner scan = new Scanner(System.in);
		double sum = 0;
		double number = 0;
		while(scan.hasNext()){
			number=scan.nextInt();
			sum+=number;
		}
		System.out.println(sum);
	}
}