#include <iostream>
#include <vector>
using namespace std;
int main()
{
	int N,v,d=0;
	vector<int> A;
	cin >> N;
	A.resize(N);
	for (int i = 0; i < N; i++)
	{
		cin >> A.at(i);
		d += A.at(i);
	}
	cin >> v;

	cout << (d - v) << endl;
	
	return 0;
}