#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


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