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;
        for(int i = 0; i < 40; i++) {
            int a = Integer.parseInt(read.readLine());
            x += a;
        }
        System.out.println(x);
        read.close();
    }
}