import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class adunare {

	public static void main(String[] args) {

		BufferedReader input;
		BufferedWriter output;
		try {
			input = new BufferedReader(new FileReader("adunare.in"));
			output = new BufferedWriter(new FileWriter("adunare.out"));
			
			String str;
			Integer n = 0;
			
			while ( (str = input.readLine()) != null){
				n += Integer.parseInt(str);
			}
			input.close();
			output.write(Integer.toString(n));
			
			output.close();
			
		} catch (IOException e) {
		}
		
	

		
	}

}