#include <iostream>

using namespace std;

int N;
int A[1000];
int v;
int main()
{
	cin >> 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;
}