import java.io.*;
public class No_9008{
	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)){
				String sNumber = br.readLine();
				String[] sNum = sNumber.split(" ");
				Long[] num = new Long[sNum.length];
				for(int i = 0; i < num.length; i++){
					num[i] = Long.parseLong(sNum[i]);
					sum += num[i];
				}
			}
			System.out.println(sum);
		}catch(IOException e){}
	}
}