#include "iostream"
using namespace std;

int N;
int num[10000];
int mis;
int ans;

int main() {
	cin >> N;
	for (int i = 0; i < N; i++) {
		cin >> num[i];
		ans += num[i];
	}
	cin >> mis;
	ans -= mis;
	cout << ans << "\n";
}