import java.io.*;
public class No_9009{
	public static void main(String args[]){
		try{
			long sum = 0;
			BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
			int counter = Integer.parseInt(br.readLine());
			if((2 <= counter) && (counter <= 500000)){
				long[] num = new long[counter];
				for(int i = 0; i < num.length; i++){
					num[i] = Long.parseLong(br.readLine());
					sum += num[i];
				}
			}
			System.out.println(sum);
		}catch(IOException e){}
	}
}