#include <iostream>
using namespace std;

int main() {
	int n;
	cin >> n;
	int a[10000];
	for (int i = 0; i < n; i++)cin >> a[i];
	long sum = 0;
	for (int i = 0; i < n; i++)sum += a[i];
	long v;
	cin >> v;
	cout << sum - v << endl;
	return 0;
}