import java.util.*;

public class Test39{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
		
        int N = sc.nextInt();
		int[] num = new int[N];
		int sum = 0;
		
		for(int i=0; i<num.length; i++){
			num[i] = sc.nextInt();
			sum += num[i];
		}
		
		int V = sc.nextInt();
		
		System.out.println(sum-V);
    }
}