#include <iostream>
#include <string>
#include <vector>
#include <cmath>
#include <fstream>
#include <set>
#include <utility>
#include <algorithm>

using namespace std;

int max(int x, int y) {
	int a;
	(x > y) ? a = x : a = y;
	return a;
}

int min(int x, int y) {
	int a;
	(x < y) ? a = x : a = y;
	return a;
}

int main() {
	int n,sum=0;
	cin >> n;
	vector<int> v(n);
	for (int i = 0; i < n; i++) {
		int x;
		cin >> x;
		sum += x;
	}
	int vv;
	cin >> vv;
	cout << sum - vv << endl;


	return 0;
}