#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <utility>
#include <string>

using namespace std;

int main() {
	int n, a, m;
	int sum = 0;
	cin >> n;
	for (int i = 0; i < n; i++) {
		cin >> a;
		sum += a;
	}
	cin >> m;

	cout << sum - m << endl;
	return 0;
}