#include <bits/stdc++.h>
using namespace std;

int main() {
	int n, s;
	s = 0;
	cin >> n;

	for (int i = 0; i < n; i++) {
		int x;
		cin >> x;
		s += x;
	}

	int v;
	cin >> v;

	cout << s - v << endl;
}