#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <stdio.h>
#include <cstring>
#include <queue>
#include <stack>
#include <functional>
#include <math.h>
#include <iomanip>
using namespace std;
#define Would
#define you

int main() {
	int n, k[10005], a, sum = 0;
	cin >> n;
	for (int i = 0; i < n; ++i) {
		cin >> k[i];
		sum += k[i];
	}
	cin >> a;
	cout << sum - a << endl;
}