import java.math.*;
import java.util.*;
public class big 
{
	public static void main(String[] args)
	{
		Scanner in=new Scanner(System.in);
		BigInteger sum=BigInteger.valueOf(0);
		BigInteger a=in.nextBigInteger();
		while(a.compareTo(BigInteger.valueOf(0))!=0)
		{
			sum=sum.add(a);
			 a=in.nextBigInteger();
		}
		System.out.println(sum);
	}
}