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){
            try {
                int a = Integer.parseInt(read.readLine());
                x += a;
                i++;
            }
            catch (NumberFormatException exp){
                System.out.println("Должно быть введено число");
            }
        }
        System.out.println(x);
        read.close();
    }
}