#include<iostream>
#include<algorithm>
#include<string>
#include<cstdlib>
#include<map>
#include<iomanip>
#include<sstream>
using namespace std;


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