#include <iostream>
#include <vector>
#include <list>
#include <algorithm>

using namespace std;

int main() {
	
	int N;
	cin>> N;
	
	vector<int> A(N);
	
	for(auto& a : A)
		cin >> a;
	
	int v;
	
	cin>> v;
	
	int sum{};
	
	for(auto a : A)
		sum += a;
		
		
	cout << sum - v;
	
	
	
	return 0;
}