import java.util.Scanner;

public class Nsum {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		long a = sc.nextInt();
		long x = 0;
		for (long i = 1 ; i <= a ; i++){
			long b = sc.nextInt();
			x += b;
			if(i == a){
				System.out.println(x);
			}
		}
	}

}