import java.io.BufferedReader;
        import java.io.IOException;
        import java.io.InputStreamReader;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader read = new BufferedReader(new InputStreamReader(System.in));
        int x = 0;
        int i = 0;
        while(i != 40){
            String s = read.readLine();
            if(s.equals("")){
                break;
            }
            int a = Integer.parseInt(s);
            x += a;
            i++;
        }
        System.out.println(x);
        read.close();
    }
}