#include <iostream>
#include <vector>
#include <numeric>

using namespace std;

int main() {
	int n;
	cin >> n;
	vector<int> a(n);
	for (int i = 0; i < n; ++i) {
		cin >> a[i];
	}
	int v;
	cin >> v;
	int sum = accumulate(a.begin(), a.end(), 0);
	cout << (sum - v) << endl;
	return 0;
}