import java.io.*;
import java.util.*;

class WholeProgram {
  public static void main(String args[])   {
    String Line;
    int TOTAL = 0;
    try     {
      BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
      while (true) {
        Line = stdin.readLine();
        if (Line == null) break;
        StringTokenizer st = new StringTokenizer(Line);
        int x = Integer.parseInt(st.nextToken());
        TOTAL += x;
      }
    }
    catch (EOFException e) { }
    catch (IOException e) { }
    System.out.println(TOTAL);
  }
}