import java.util.*;
import java.math.*;
public class Main {
	public static void main(String args[]){
		Scanner in=new Scanner(System.in);
		BigInteger ans=BigInteger.ZERO;
		while(in.hasNextBigInteger())
			ans=ans.add(in.nextBigInteger());
		System.out.print(ans.toString(10));
		in.close();
	}
}